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
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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
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
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
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.简算
1.234×1.234+0.766×0.766+2.468×0.766
=1.234²+2×1.234×0.766+0.766²
=(1.234+0.766)²
=2²
=4