题目内容

(1)计算:2
3
×
31.5
×
612

(2)化简:(-2x
1
4
y-
1
3
)(3x-
1
2
y
2
3
)(-4x
1
4
y
2
3
)
(1)2
3
×
31.5
×
612

=3
1
2
×(
3
2
)
1
3
×12
1
6

=3
1
2
×3
1
3
×3
1
6
×2-
1
3
×2
1
3

=3
1
2
+
1
3
+
1
6
×20

=2×3=6;
(2)(-2x
1
4
y-
1
3
)(3x-
1
2
y
2
3
)(-4x
1
4
y
2
3
)

=(-2)×3×(-4)x
1
4
-
1
2
+
1
4
y-
1
3
+
2
3
+
2
3

=24y.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网