兵器谱——汇集古今中外经典兵器
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请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=
请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6x+2y+3z=15 ①x-y+7z=20 ②x+3y+2z=14③由①+②×2得：3x+15z=55④由②×3+③得：4x+23z=74⑤由⑤×3-④×4得：z=57/9将z代入到④中得x=-40/3将x,z代入到②中得：y=11故x=-40/3y=11z=57/9 2）3式相加,得x+y-z+y+z-x+z+x-y=3+5+7x+y+z=15z=6y=4x=53）x+y-z=0.5（1）x-3y+2z=0（2）3x+2y-z=2 （3）（1）*2+（2）3x-y=1 (4)(1)-(3)-2x-y=-1.5 (5)(4)-(5)5x=2.5x=0.5代入（4）解得y=-0.5把x y代入（1）解得z=-0.5孩子你几年级啊，还是好好学习吧，这些题目都很简单的。都是用代数式加减消元的、、、教科书上有，何必再问呢
兵器谱，汇集天下名器。Problem 17A
1) 38.7 cm 2) 58.5.cm 3) 1.15 m 4) -143 N 5) 3.50 x 10^-4 N6) 1.4 x 10^-3 N 7) 1.60 x 10^-19 C 8) 1.60 x 10^-19 C 9) 1.60 x 10^-19 C 10) 2.2 x 10^-17 C
Problem 17B
1) F(tot)=1.8 x 10^-10 N, 45? 2) 2.24 x 10^10 N pointing upward along the y-axis 3) F(tot)=1.74 x 10^-7 N, -21.22? 4) 3.84 x 10^-6 N directected along the -y axis 5) F(tot)=4.82 x 10^-19 N, 45? 6) F(tot)=4.53 x 10^-6 N, 26.6? 7) F(tot)=3.97 x 10^-8 N, 9.29? 8) F(x,tot)=7.2x10^4 N, F(y,tot)= -1.8 x 10^4 N, F(tot)=7.4 x 10^4 N, -14? 9) F(tot)=3.66 x 10^5 N, 45? 10) F(tot)=0 N along the x axis
Problem 17C
1) -1.7 x 10^-1 N 2) 18 N 3) 259 N 4) 16 cm 5) 36 cm 6) 7.3 cm
Problem 17D
1) -54 N in the -x direction 2) 7.5 x 10^-6 N in the +y direction 3) -3.29 x 10^-14 N upward 4) 4.40x10^5 N/C, 89.1? 5) 3.15 x 10^5 N/C 6) 5.06 x 10^-12 C 7) 1.61 x 10^-12 C 8) 3.6 x 10^-10 m 9) -0.67 mm 10) -1.37 x 10^-7 m
Section 17-1 Review, page 633
1) It is equal to the magnitude of the rod' Charge is conserved. 2) Charge is quantized. 3) 6.25 x 10^19 electrons 4) The taped induces a surface charge on the desk, so the two are attracted to one another. 6) More paint hits the object being painted because of an electrical attraction between the chargted droplets and the oppositely charged object.
Section 17-2 Review, page 642
1a) 4.4 N b) attractive c) 1.2 x 10^13 electrons 2) both are field forces, both are electric forces are attractive or repulssive whnile gravitational forces are always attractive, electric force is significantly stronger than gravitational force 3) 7.3 x 10^-8 N, along the negative x axis 4) 35.2 cm from q(1) (24.8 cm from q(2)) 5) new distance = 1/sqrt(2)(old distance)
Section 17-3 Review, page 652
1) 8.0 x 10^3 N/C, directed toward the 40.0 x 10^-9 C charge 2a) -3/8 b) q(1) q(2) is positive 3a) All lines should point away from the two charges, and one charge should have four time as many lines as the other. b) All lines should point toward the tow charges, and one charge should have four times as many lines as the other. 4) because charge accumulated at sharp points 5) They experience an electrical attraction that pulls them back toward the object.
Section 17-1 Worksheet
1a) Experiment A, no charges were transferred. Experiment B, charges were tranferred between the sphere and the ground. Experiment C, Charges were transferred between the sphere and the rod. b) Diagrams should show: Spher A, negative charges (-) on the left, positive (+) Sphere B, excess (-) Sphere C, excess (+) d) Experiment A e) no change in Experiment A or Experiment B; reduced charge in Experiment C
Section 17-2 Worksheet
1a) 20.0 cm b) 0.899 N (attraction along the line q(1)-q(3)) c) 0.899 N (attraction along the line q(1)-q(2)) d) 1.40 N repulsion pulling to the right e) Diagrams should show F(1) pointing from q(3) toward q(1) and F(2) pointing from q(3) toward q(2) f) 36.9? g) F(1x)=-0.709 N; F(2x)=0.719 N; F(1Y)=-0.540 N; F(2y)=-0.540 N h) -1.08 N pointing down i) downward along the y-axis
Section 17-3 Worksheet
1a) 21.2 cm b) all same strength of 1.60x10^-6 N/C along the diagonal lines, with E(1) pointing away from q(1), E(2) from q(2), E(3) from q(3), and E(4) from q(4) c) Resultant electric field E=0 2a) 4.61x10^-14 N down b) 4.61x10^-14 N up c) 1.44x10^-18 C d) 9 electrons已知函数f(x)=a根号x/x+b的图像在点(1,f(1))处的切线方程是x－18y+5=0_百度知道
已知函数f(x)=a根号x/x+b的图像在点(1,f(1))处的切线方程是x－18y+5=0
已知函数f(x)=a根号x/x+b的图像在点(1,f(1))处的切线方程是x－18y+5=0(1)求a,b的值（2）求函数f(x)在[1，9]上的最值
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我们会通过消息、邮箱等方式尽快将举报结果通知您。【怪物○17-05-18 ○ 求助】定制安妮是全血还是全速？【怪物x联盟吧】_百度贴吧
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【怪物○17-05-18 ○ 求助】定制安妮是全血还是全速？
新区，看之前的攻略说全血，看最近的帖子又很多说全速的，到底怎么弄
安妮内战pk谁的速度快谁不出手，所以有些为了pk能赢就全速加点。但推图却需要全血！看你需要什么了
看你怎么用了
普通PK推图全血，内战在不高于对手三倍速度的情况下全速
速度高内战有用
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保存至快速回贴444.　求下列函数的导数:(1) y=x3-3x2+4x-5；　　　　　　(2) ；(3) y=5x3-2x+3ex；(4) y=2tan?x+sec?x-1；(5) y=ln?x-2lg?x+3log2x；(6) y=sin?xcos?x；(7) y=x2ln?x；(8) y=3excos?x；(9) y=(2+3x)(4-7x)；(10) y=；(11) y=；(12) ；(13) ；(14) ；(15) ；(16) y=x2lnxcos?x；(17) ；(18) ；(19) ；(20) ；(21) y=；(22) y=e-x；(23) .
相关工具书解释
解　(1) y′=3x2-6x+4.　　　　(2) y′=-20x-6-28x-5+2x-2.(3) y′=15x2-2xln?2+3ex.(4) y′=2sec2x+sec?xtan?x.(5) .(6) .(7) y′=2xln?...
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