计算下列各式:(1)(-2x 2 y 3 ) 2 ?(xy) 3 (2)(x+y)(x 2 -xy+y 2 )(3)(x+2y-3)(x-2y+3
计算下列各式:(1)(-2x2y3)2?(xy)3(2)(x+y)(x2-xy+y2)(3)(x+2y-3)(x-2y+3)(4)(4a2b7+3a3b8-4a2b6)÷...
计算下列各式:(1)(-2x 2 y 3 ) 2 ?(xy) 3 (2)(x+y)(x 2 -xy+y 2 )(3)(x+2y-3)(x-2y+3)(4)(4a 2 b 7 +3a 3 b 8 -4a 2 b 6 )÷(-2ab 3 ) 2 (5)4(x+1) 2 -2(x+5)(x-5)
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(1)原式=4x 4 y 6 ?x 3 y 3 =4x 7 y 9 . (2)原式=x 3 -x 2 y+xy 2 +x 2 y-xy 2 +y 3 =x 3 -y 3 . (3)原式=[x+(2y-3)][x-(2y-3)] =x 2 -(2y-3) 2 =x 2 -4y 2 +12y-9. (4)原式=(4a 2 b 7 +3a 3 b 8 -4a 2 b 6 )÷4a 2 b 6 =b+
(5)原式=4x 2 +8x+4-2x 2 +50 =2x 2 +8x+54. |
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