计算题:(1)x 5 ?(-3x) 2 -(-x 2 ) 3 ?(-7x);(2)(- 1 3 x 2 y)(-9xy+1);(3
计算题:(1)x5?(-3x)2-(-x2)3?(-7x);(2)(-13x2y)(-9xy+1);(3)(a2+3)(a-2)-a(a2-2a-2);(4)(5x+2y...
计算题:(1)x 5 ?(-3x) 2 -(-x 2 ) 3 ?(-7x);(2)(- 1 3 x 2 y)(-9xy+1);(3)(a 2 +3)(a-2)-a(a 2 -2a-2);(4)(5x+2y)(-2y+5x)-(x-2y) 2 .
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(1)x 5 ?(-3x) 2 -(-x 2 ) 3 ?(-7x), =x 5 ?9x 2 -(-x 6 )(-7x), =9x 7 -7x 7 , =2x 7 ; (2)(-
=3x 3 y 2 -
(3)(a 2 +3)(a-2)-a(a 2 -2a-2), =a 3 -2a 2 +3a-6-a 3 +2a 2 +2a, =5a-6; (4)(5x+2y)(-2y+5x)-(x-2y) 2 , =25x 2 -4y 2 -x 2 +4xy-4y 2 , =24x 2 -8y 2 +4xy. |
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