>
数学
>
(3y-1)(2y-3)+(6y-5)(y-4)=______,[ab(3-b)-2a(b-
1
2
b
2
)](-3a
2
b
3
)=______.
人气:305 ℃ 时间:2020-01-29 00:29:33
解答
①(3y-1)(2y-3)+(6y-5)(y-4),
=6y
2
-11y+3+6y
2
-29y+20,
=12y
2
-40y+23;
②[ab(3-b)-2a(b-
1
2
b
2
)](-3a
2
b
3
),
=(3ab-ab
2
-2ab+ab
2
)(-3a
2
b
3
),
=(ab)(-3a
2
b
3
),
=-3a
3
b
4
.
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