摘要:①(5―6b)―(2―5b), ②52y―[8―3(22y+3―2)]
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化简,求值
(1)(8a-6b)-(4a-5b)+(3a-2b)
(2)3x2y-2[
x2y-(x2y-
x2)-2x2]
(3)-(3a2-4ab)+[a2-2(2a+2ab)],其中a=-2,b=
.
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(1)(8a-6b)-(4a-5b)+(3a-2b)
(2)3x2y-2[
1 |
2 |
1 |
4 |
(3)-(3a2-4ab)+[a2-2(2a+2ab)],其中a=-2,b=
3 |