问题 解答题
计算:
(1)(-3a32-a3+(-4a)2-a7+(-5a33
(2)30-23+(-3)2-(
1
2
-1
(3)5x(x2+2x+1)-(2x+3)(x-5);
(4)(2x-3y)(-2x-3y)+(x-4y)2
答案

(1)原式=9a9+16a9-125a9=-100a9

(2)原式=1-8+9-2=0;

(3)原式=5x3+10x2+5x-(2x2-7x-15)=5x3+8x2+12x+15;

(4)原式=9y2-4x2+x2-8xy+16y2=25y2-8xy-3x2

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