题目内容

递等计算(能简便的要简便)
420-375÷25;
12÷1.5+1.5×0.08;
0.25×
3
7
×32×1
1
6
×1.25;
1
5
7
÷(5-3.9×
2
3
);
3
5
×101-
3
5
3.4÷[(0.2+
1
3
)×1
1
4
]
(1)420-375÷25
=420-15
=405;

(2)12÷1.5+1.5×0.08
=8+0.12
=8.12;

(3)0.25×
3
7
×32×1
1
6
×1.25
=0.25×
3
7
×(4×8)×1
1
6
×1.25
=(0.25×4)×(
3
7
×1
1
6
)×(8×1.25)
=1×
1
2
×10
=5;

(4)1
5
7
÷(5-3.9×
2
3

=1
5
7
÷(5-2.6)
=1
5
7
÷2.4
=
5
7


(5)
3
5
×101-
3
5

=
3
5
×(101-1)
=
3
5
×100
=60;

(6)3.4÷[(0.2+
1
3
)×1
1
4
]
=3.4÷[
8
15
×1
1
4
]
=3.4÷
2
3

=5.1.
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