数学题（完全平方公式）一.填空1.(a-b)(a-b)=4,ab=0.5,则(a+b)(a+b)=_____2.(x+y)(x+y)=9,(x-y)(x-y)=5,则xy=_____3.x·x+2x+y·y-6y=-10,则x=____,y=____二.简算1.234×1.234+0.766×0.766+2.468×0.766
问题描述：
数学题（完全平方公式）
一.填空
1.(a-b)(a-b)=4,ab=0.5,则(a+b)(a+b)=_____
2.(x+y)(x+y)=9,(x-y)(x-y)=5,则xy=_____
3.x·x+2x+y·y-6y=-10,则x=____,y=____
二.简算
1.234×1.234+0.766×0.766+2.468×0.766
答
一.填空1.(a-b)(a-b)=4,ab=0.5,则(a+b)(a+b)=__(a-b)²+4ab=6___2.(x+y)(x+y)=9,(x-y)(x-y)=5,则xy=__[(x+y)²-(x-y)²]/4=1___3.x·x+2x+y·y-6y=-10(x+1)²+(y-3)²=0则x=__-1__,y=__3__二.简...