题目内容

用你喜欢的方法计算.
①1375+450÷18
②101×43
7
9
÷
2
3
÷
2
3
④20.9+10.2÷(5.2-3.5)
4
5
×0.75+0.75×
1
5
①1375+450÷18,
=1375+450÷(9×2),
=1375+450÷9÷2,
=1375+50÷2,
=1375+25,
=1400;

②101×43,
=(100+1)×43,
=100×43+1×43,
=4300+43,
=4343;

7
9
÷
2
3
÷
2
3

=
7
9
÷(
2
3
×
2
3
),
=
7
9
×
9
4

=
7
4


④20.9+10.2÷(5.2-3.5),
=20.9+10.2÷1.7,
=20.9+6,
=26.9;

4
5
×0.75+0.75×
1
5

=(
4
5
+
1
5
)×0.75,
=1×0.75,
=0.75.
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