1.(x+1)(2x-3)-(x-1)(x+2)=x.x+71.(x+1)(2x-3)-(x-1)(x+2)=x.x+72.(2x+1)(4x.x-2x+1)-2x(4x.x+1)=03.(x-3)(x+2)=x.x-16

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/01 07:29:36
1.(x+1)(2x-3)-(x-1)(x+2)=x.x+71.(x+1)(2x-3)-(x-1)(x+2)=x.x+72.(2x+1)(4x.x-2x+1)-2x(4x.x+1)=03.(x-3)(x+2)=x.x-16
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1.(x+1)(2x-3)-(x-1)(x+2)=x.x+71.(x+1)(2x-3)-(x-1)(x+2)=x.x+72.(2x+1)(4x.x-2x+1)-2x(4x.x+1)=03.(x-3)(x+2)=x.x-16
1.(x+1)(2x-3)-(x-1)(x+2)=x.x+7
1.(x+1)(2x-3)-(x-1)(x+2)=x.x+7
2.(2x+1)(4x.x-2x+1)-2x(4x.x+1)=0
3.(x-3)(x+2)=x.x-16

1.(x+1)(2x-3)-(x-1)(x+2)=x.x+71.(x+1)(2x-3)-(x-1)(x+2)=x.x+72.(2x+1)(4x.x-2x+1)-2x(4x.x+1)=03.(x-3)(x+2)=x.x-16
1、展开得:(2x^2-x-3)-(x^2+x-2)=x^2+7,
——》x=-4;
2、展开得:(8x^3+1)-(8x^3+2x)=0,
——》x=1/2;
3、展开得:x^2-x-6=x^2-16,
——》x=10.

乘出来二次都消掉了 很简单的