標題:

方程(請列明點搵到)

發問:

(一) 1.3(x+2)=21 2.4(y+2)=10 3.2(x-5)=3 4.6(y-2)=40 5.4(3x-7)=-13 6.3(2y-9)=9 7.3(2-x)=6 8.5(3-4y)=7 9.2(2-3y)=-20 10.4(2-7y)=-27 (二) 1.9- m/3 = 2/3m 2.4a+ 1/8 = a/4 3.2y/5 = 1- y/2 4.7d/3 -d = 8 5.2e/5 = 2+ 4e/5 6.2+ x/3 - x/27 = 9/2 7*.x/3 = x+2/4 8*.2x-1/3 = x+2/2 更新: 第二part呢?

最佳解答:

(一) 1) 3(x+2)=21 x+2=7 x=5 2) 4(y+2)=10 y+2=2.5 y=0.5 3) 2(x-5)=3 x-5=1.5 x=6.5 4) 6(y-2)=40 6y-12=40 6y=52 y=8.6666666666...... 5) 4(3x-7)=-13 12x-28=13 12x=15 x=1.25 6) 3(2y-9)=9 2y-9=3 2y=12 y=6 7) 3(2-x)=6 2-x=2 x=0 8) 5(3-4y)=7 15-20y=7 8=20y y=0.4 9) 2(2-3y)=-20 2-3y=-10 12=3y y=4 10) 4(2-7y)=-27 8-28y=-27 35=28y y=1.25 (二) 1) 9- m/3 = 2/3m 9=3m/3 m=9 2) 4a+ 1/8 = a/4 32a+1=2a 30a=-1 a=-1/30 3) 2y/5 = 1- y/2 4y=10-5y 9y=10 y=10/9 4) 7d/3 -d = 8 7d-3d=24 4d=24 d=6 5) 2e/5 = 2+ 4e/5 2e=10+4e -2e=10 e=-5 6) 2+ x/3 - x/27 = 9/2 12+2x-6X/27=27 324+54x-6x=729 48x=405 x=8.4375 7) x/3 = x+2/4 4x=3x+6 x=6 8) 2x-1/3 = x+2/2 4x-2=3x+6 x=8 2009-11-26 19:19:08 補充： 第2part係通份母 跳左既嗰d步驟你應該知掛

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其他解答:

(一) 1. 3(x + 2) = 21 x + 2 = 7 x = 5 2. 4(y + 2) = 10 y + 2 = 2.5 y = 0.5 3. 2(x - 5) = 3 x - 5 = 1.5 x = 6.5 4. 6(y - 2) = 40 6y - 12 = 40 6y = 52 y = 52 / 6 = 26 / 3 5) 4(3x - 7) = -13 3x - 7 = - 13 / 4 3x = 15 / 4 x = 15 / 12 = 5 / 4 6) 3(2y - 9) = 9 2y - 9 = 3 2y = 12 y = 6 7) 3(2 - x) = 6 2 - x = 2 x = 0 8) 5(3 - 4y) = 7 3 - 4y = 7 / 5 4y - 3 = - 7 / 5 4y = 8 / 5 y = 8 / 20 = 2 / 5 9) 2(2 - 3y) = - 20 2 - 3y = -10 3y = 12 y = 4 10) 4(2 - 7y) = - 27 2 - 7y = - 27 / 4 7y = 35 / 4 y = 35 / 28 = 5 / 4FAD2A23AB937987B
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