问题
解答题
化简:
(1)3a-5b-2a+b
(2)4x2+5xy-2(2x2-xy)
答案
(1)原式=(3a-2a)+(-5b+b)
=a+(-4b)
=a-4b;
(2)原式=4x2+5xy-4x2+2xy
=7xy.
化简:
(1)3a-5b-2a+b
(2)4x2+5xy-2(2x2-xy)
(1)原式=(3a-2a)+(-5b+b)
=a+(-4b)
=a-4b;
(2)原式=4x2+5xy-4x2+2xy
=7xy.