问题
解答题
计算: (1)(2a-b)-(2b-3a)-2(a-2b) (2)(4x2-5xy)-(
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答案
(1)原式=2a-b-2b+3a-2a+4b=3a+b;
(2)原式=4x2-5xy-
y2-2x2+6xy-1 3
y2-1 2
y2=2x2+xy-y2.1 6
计算: (1)(2a-b)-(2b-3a)-2(a-2b) (2)(4x2-5xy)-(
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(1)原式=2a-b-2b+3a-2a+4b=3a+b;
(2)原式=4x2-5xy-
y2-2x2+6xy-1 3
y2-1 2
y2=2x2+xy-y2.1 6