题目内容
计算:
(1)(2a-b)-(2b-3a)-2(a-2b)
(2)(4x2-5xy)-(
y2+2x2)+2(3xy-
y2-
y2).
(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-
y2-
y2=2x2+xy-y2.
(2)原式=4x2-5xy-
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