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715÷1.25÷8

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/08 04:37:00
7
1
5
÷1.25÷8
(1)7
1
5÷1.25÷8,
=7.2÷(1.25×8),
=7.2÷10,
=0.72;
(2)136-136×
4
5-136×0.2,
=136-136×
4
5-136×
1
5,
=(1-
4
5-
1
5)×136,
=0;
(3)17÷51+(
1
68+
2
51)×17,
=
1
3+
1
68×17+
2
51×17,
=
1
3+
1
4+
2
3,
=(
1
3+
2
3)+
1
4,
=1+
1
4,
=1
1
4.