2011初一下学期数学人教版复习题8的2小题[用加减法解下列方程组]求.[1]3m加b=11,-4m-b=11.[2]0.6x-0.4y=1.1,0.2x-0.4y=2.3[3]4f加g=15,3g-4f=-3[4]1/2x加3y=-6,1/2X加Y=2谢谢
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![2011初一下学期数学人教版复习题8的2小题[用加减法解下列方程组]求.[1]3m加b=11,-4m-b=11.[2]0.6x-0.4y=1.1,0.2x-0.4y=2.3[3]4f加g=15,3g-4f=-3[4]1/2x加3y=-6,1/2X加Y=2谢谢](/uploads/image/z/7069602-66-2.jpg?t=2011%E5%88%9D%E4%B8%80%E4%B8%8B%E5%AD%A6%E6%9C%9F%E6%95%B0%E5%AD%A6%E4%BA%BA%E6%95%99%E7%89%88%E5%A4%8D%E4%B9%A0%E9%A2%988%E7%9A%842%E5%B0%8F%E9%A2%98%5B%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E7%BB%84%5D%E6%B1%82.%5B1%5D3m%E5%8A%A0b%3D11%2C-4m-b%3D11.%5B2%5D0.6x-0.4y%3D1.1%2C0.2x-0.4y%3D2.3%5B3%5D4f%E5%8A%A0g%3D15%2C3g-4f%3D-3%5B4%5D1%2F2x%E5%8A%A03y%3D-6%2C1%2F2X%E5%8A%A0Y%3D2%E8%B0%A2%E8%B0%A2)
2011初一下学期数学人教版复习题8的2小题[用加减法解下列方程组]求.[1]3m加b=11,-4m-b=11.[2]0.6x-0.4y=1.1,0.2x-0.4y=2.3[3]4f加g=15,3g-4f=-3[4]1/2x加3y=-6,1/2X加Y=2谢谢
2011初一下学期数学人教版复习题8的2小题[用加减法解下列方程组]求.
[1]3m加b=11,-4m-b=11.[2]0.6x-0.4y=1.1,0.2x-0.4y=2.3[3]4f加g=15,3g-4f=-3[4]1/2x加3y=-6,1/2X加Y=2谢谢
2011初一下学期数学人教版复习题8的2小题[用加减法解下列方程组]求.[1]3m加b=11,-4m-b=11.[2]0.6x-0.4y=1.1,0.2x-0.4y=2.3[3]4f加g=15,3g-4f=-3[4]1/2x加3y=-6,1/2X加Y=2谢谢
(1)b=77 m=-66
(2)x=-3 y=-7.25
(3)g=3 f=3
(4)x=12 y=-4
1.
3m+b=11 -4m-b=11
设3m+b=11为A
-4m-b=11为B
A+B= 3m+b+(-4m)-b=11+11
3m-4m=22
-m=22
m=-22
把m=-22带入B
得:b为77
3m+b=11(1),-4m-b=11(2).
(1)+(2),3m+b+(-4m)-b=11+11
-m=22
m=-11
b=77
0.6x-0.4y=1.1(1),0.2x-0.4y=2.3(2)
(1)-(2),0.6x-0.4y-0.2x-(-0.4y)=1.1-2.3
0.4x=-1.2
x=-3
y=-29/4
1.
3m+b=11 -4m-b=11
设3m+b=11为A
-4m-b=11为B
A+B= 3m+b+(-4m)-b=11+11
3m-4m=22
-m=22
m=-22
把m=-22带入B
得:b为77