问题 解答题
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
答案

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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