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](/uploads/image/z/1836042-42-2.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%88%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%85%AC%E5%BC%8F%EF%BC%89%E4%B8%80.%E5%A1%AB%E7%A9%BA1.%28a-b%29%28a-b%29%3D4%2Cab%3D0.5%2C%E5%88%99%28a%2Bb%29%28a%2Bb%29%3D_____2.%28x%2By%29%28x%2By%29%3D9%2C%28x-y%29%28x-y%29%3D5%2C%E5%88%99xy%3D_____3.x%C2%B7x%2B2x%2By%C2%B7y-6y%3D-10%2C%E5%88%99x%3D____%2Cy%3D____%E4%BA%8C.%E7%AE%80%E7%AE%971.234%C3%971.234%2B0.766%C3%970.766%2B2.468%C3%970.766)
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
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