计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2 .
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计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2.计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2.计算.2
计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2 .
计算.25(x+y)^2-0.81(x-y)^2
0.25(x+y)^2-0.81(x-y)^2 .
计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2 .
分解因式
0.25(x+y)^2-0.81(x-y)^2
=[0.5(x+y)+0.9(x-y)][0.5(x+y)-0.9(x-y)]
=(1.4x-0.4y)(0.4x+1.4y)
这个只能化解不能计算啊。没有xy怎么计算呢,是不是有已知条件没有写全呢?
=(5(x+y)+0.9(x+y))-(5(x+y)-0.9(x+y))
=(5.9x+5.9y)-(4.1x+4.1y)
=1.8x+1.8y
=1.8(x+y)
望采纳
原式=[5(x y)]^2-[0.9(x-y)]^2=[5(x y) 0.9(x-y)][5(x y)-0.9(x-y)]=(5.9x 4.1y)(4.1x 5.9y)=后面再用多项式乘以多项式的法则做
计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2 .
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