简单的化简求值1.(ab+1)^2-(ab-1)^22.x(x+2y)-(x+1)^23Q(十万火急)
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简单的化简求值1.(ab+1)^2-(ab-1)^22.x(x+2y)-(x+1)^23Q(十万火急)
简单的化简求值
1.(ab+1)^2-(ab-1)^2
2.x(x+2y)-(x+1)^2
3Q(十万火急)
简单的化简求值1.(ab+1)^2-(ab-1)^22.x(x+2y)-(x+1)^23Q(十万火急)
1.(ab+1)^2-(ab-1)^2
=[(ab+1)-(ab-1)][(ab+1)+(ab-1)]
=2*2ab
=4ab
2.x(x+2y)-(x+1)^2
=x^2+2xy-x^2-2x-1
=2xy-2x-1
1.(ab+1)²-(ab-1)²
=2ab×2
=4ab
2.x(x+2y)-(x+1)²
=x²-(x+1)²+2xy
=-2x-1+2xy
=2x(y-1)-1
1.(ab+1)^2-(ab-1)^2
=(ab+1+ab-1)(ab+1-ab+1)
=2ab×2
=4ab
2.x(x+2y)-(x+1)^2
=x²+2xy-x²-2x-1
=2xy-2x-1
^什么意思啊?
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2.yfkd6865d9iw
1 .(ab+1)^2-(ab-1)^2
=a^2b^2+2ab+1-(a^2b^2-2ab+1)
=a^2b^2+2ab+1-a^2b^2+2ab-1
=-4ab
2 .x(x+2y)-(x+1)^2
=x^2+2xy-(x^2+2x+1)
=x^2+2xy-x^2-2x-1
=2xy-2x-1
你这也不是等式啊 变量也不一样 怎么求值
.(ab+1)^2-(ab-1)^2
=[(ab+1)-(ab-1)][(ab+1)+(ab-1)]
=2*2ab
=4ab
2. x(x+2y)-(x+1)^2
=x^2+2xy-x^2-2x-1
=2xy-2x-1