1 .a三次方+ab²-2a²b 2.4-12(x-y)+9(x-y)²
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1 .a三次方+ab²-2a²b 2.4-12(x-y)+9(x-y)²
1 .a三次方+ab²-2a²b 2.4-12(x-y)+9(x-y)²
1 .a三次方+ab²-2a²b 2.4-12(x-y)+9(x-y)²
a三次方+ab²-2a²b
=a(a^2+b^2-2ab)
=a(a^2-2ab+b^2)
=a(a-b)^2
4-12(x-y)+9(x-y)²
=2^2-2*2*3(x-y)+(3(x-y))^2
=(2-3(x-y))^2
=(2-3x+3y)^2
=(3y-3x+2)^2
1 .a三次方+ab²-2a²b
=a(a+b^2-2ab)
=a(a-b)^2
2. 4-12(x-y)+9(x-y)²
=(3(x-y)-2)^2
=(3x-3y-2)^2
1 .a三次方+ab²-2a²b=a(a^2+b^2-2ab)=a(a-b)^2
2. 4-12(x-y)+9(x-y)²=(3x-3y-2)^2
1 .a三次方+ab²-2a²b
=a(a²+b²-2ab)
=a(a-b)²
2. 4-12(x-y)+9(x-y)²
=[3(x-y)-2]²
=(3x-3y-2)²