2(2x+3y)(3x+2y)-(6x-y)(2x-5y) =12x^2+26xy+12y^2-
问题描述:
2(2x+3y)(3x+2y)-(6x-y)(2x-5y) =12x^2+26xy+12y^2-
2(2x+3y)(3x+2y)-(6x-y)(2x-5y)\x0d =12x^2+26xy+12y^2-(12x^2-32xy+5y^2)\x0d =12x^2+26xy+12y^2-12x^2+32xy-5y^2\x0d =58xy+7y^2
答
平方的意思你确定吗那个符号带数字几,就是几次方确定