分解因式:(1)81x²-18x+1(2)0.36a²+1-1.2a(3)(x+y)²+10(x+y)+25(4)-2x³y-2xy³+4x²y²
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分解因式:(1)81x²-18x+1(2)0.36a²+1-1.2a(3)(x+y)²+10(x+y)+25(4)-2x³y-2xy³+4x²
分解因式:(1)81x²-18x+1(2)0.36a²+1-1.2a(3)(x+y)²+10(x+y)+25(4)-2x³y-2xy³+4x²y²
分解因式:(1)81x²-18x+1(2)0.36a²+1-1.2a(3)(x+y)²+10(x+y)+25
(4)-2x³y-2xy³+4x²y²
分解因式:(1)81x²-18x+1(2)0.36a²+1-1.2a(3)(x+y)²+10(x+y)+25(4)-2x³y-2xy³+4x²y²
(1)81x²-18x+1
=(9x-1)²
(2)0.36a²+1-1.2a
=(0.6a-1)²
(3)(x+y)²+10(x+y)+25
=(x+y+5)²
(4)-2x³y-2xy³+4x²y²
=-2xy(x²-2xy+y²)
=-2xy(x-y)²
(1)81x²-18x+1
=(9x+1)²
(2)0.36a²+1-1.2a
=(0.6a-1)²
(3)(x+y)²+10(x+y)+25
=(x+y+5)²
(4)-2x³y-2xy³+4x²y²
...
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(1)81x²-18x+1
=(9x+1)²
(2)0.36a²+1-1.2a
=(0.6a-1)²
(3)(x+y)²+10(x+y)+25
=(x+y+5)²
(4)-2x³y-2xy³+4x²y²
=-2xy(x²+y²-2xy)
=-2xy(x-y)²
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