问题
解答题
化简:(1) (8a-6b)-(4a-5b)+(3a-2b) (2)3x2-[5x-4(
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答案
(1)原式=-8a-6b-4a+5b+3a-2b
=(8-4+3)a+(-6+5-2)b
=7a-3b.
(2)原式=3x2-[5x-2x2+4]+5x2
=3x2-5x+2x2-4+5x2
=10x2-5x+4.
化简:(1) (8a-6b)-(4a-5b)+(3a-2b) (2)3x2-[5x-4(
|
(1)原式=-8a-6b-4a+5b+3a-2b
=(8-4+3)a+(-6+5-2)b
=7a-3b.
(2)原式=3x2-[5x-2x2+4]+5x2
=3x2-5x+2x2-4+5x2
=10x2-5x+4.