来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/11 21:23:11
(1)43×99+43
=43×(99+1),
=42×100,
=4200;
(2)3÷
1
2−
1
4×
3
10
=3×2-
3
40,
=6-
3
40,
=5
37
40;
(3)(27+
19
19)÷9
=27÷9+
18
19×
1
9,
=3+
2
19,
=3
2
19;
(4)
3
5÷[(
1
5+
1
3)÷
2
9]
=
3
5÷[
8
15÷
2
9],
=
3
5÷
12
5,
=
1
4.
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