问题
解答题
计算: (1)
(2)7xy+xy3+4+6x-2xy3-5xy-3; (3)(4x2y-5xy2)+(-3x2y+4xy2); (4)(5a2+2a-1)-4(3-8a+2a2) |
答案
(1)原式=-
ab+5;9 4
(2)原式=2xy-xy3+6x+1;
(3)原式=4x2y-5xy2-3x2y+4xy2=x2y-xy2;
(4)原式=5a2+2a-1-12+32a-8a2=-3a2+34a-13.