1.a²+4a+4 2.1-x+四分之(x的二次方) 3.-4a²x²+12ax-9 4.(a-2b)²-14(a-2b)+49
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1.a²+4a+4 2.1-x+四分之(x的二次方) 3.-4a²x²+12ax-9 4.(a-2b)²-14(a-2b)+49
1.a²+4a+4 2.1-x+四分之(x的二次方) 3.-4a²x²+12ax-9 4.(a-2b)²-14(a-2b)+49
1.a²+4a+4 2.1-x+四分之(x的二次方) 3.-4a²x²+12ax-9 4.(a-2b)²-14(a-2b)+49
1.a²+4a+4=(a+2)²
2.1-x+四分之(x的二次方)=(x/2-1)²
3.-4a²x²+12ax-9= -(2ax-3)²
4.(a-2b)²-14(a-2b)+49=(a-2b-7)²