问题
解答题
化简
(1)5(2x-7y)-3(4x-10y)
(2)5(a2b-3ab2)-2(a2b-7ab2)
答案
(1)原式=10x-35y-12x+30y=-2x-5y.
(2)原式=5a2b-15ab2-2a2b+14ab2=3a2b-ab2.
化简
(1)5(2x-7y)-3(4x-10y)
(2)5(a2b-3ab2)-2(a2b-7ab2)
(1)原式=10x-35y-12x+30y=-2x-5y.
(2)原式=5a2b-15ab2-2a2b+14ab2=3a2b-ab2.