作业帮1.[(x+2y)²-(x-2y)²-(x+2y)(x-2y)-4y²]÷2x,其中x=-2,y=二分之一2.（x+3)(2x-5)-(2x+1)(x-8)=413.已知3的m次方×9的m次方×27的m次方×81的m次方=3的30次方,求m的值过程详细点 回答好就采纳
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1.[(x+2y)²-(x-2y)²-(x+2y)(x-2y)-4y²]÷2x,其中x=-2,y=二分之一2.（x+3)(2x-5)-(2x+1)(x-8)=413.已知3的m次方×9的m次方×27的m次方×81的m次方=3的30次方,求m的值过程详细点 回答好就采纳
1.[(x+2y)²-(x-2y)²-(x+2y)(x-2y)-4y²]÷2x,其中x=-2,y=二分之一
2.（x+3)(2x-5)-(2x+1)(x-8)=41
3.已知3的m次方×9的m次方×27的m次方×81的m次方=3的30次方,求m的值
过程详细点 回答好就采纳
1.[(x+2y)²-(x-2y)²-(x+2y)(x-2y)-4y²]÷2x,其中x=-2,y=二分之一2.（x+3)(2x-5)-(2x+1)(x-8)=413.已知3的m次方×9的m次方×27的m次方×81的m次方=3的30次方,求m的值过程详细点 回答好就采纳
1.原式={（x+2y+x-2y）[x+2y-（x-2y）]-[x²-(2y)²]-4y²}]÷2x
=(8xy-x²)÷2x=4y-x÷2=3
2.打开括号得：2x²-5x+6x-15-(2x²-16x+x-8)=41
16x=48
x=3
3.原式=3的m次方×3的2m次方×3的3m次方×3的4m次方=3的10m次方=3的30次方,由此可得m=3