题目内容

脱式计算,能够简算的一定要简算.
3
8
÷
[(
1
5
+
1
4
)×
3
8
]
4-
4
5
÷4-
4
5
9
1
4
+9.8+9.25×
1
5
25×(4×11)×7
1
12
+
3
5
)÷
1
60
101×120-83-37.
3
8
÷
[(
1
5
+
1
4
)×
3
8
],
=
3
8
÷
3
8
÷(
1
5
+
1
4
),
=1÷
9
20

=1×
20
9

=2
2
9


②4-
4
5
÷4-
4
5

=4-
4
5
×
1
4
-
4
5

=4-(
1
5
+
4
5
),
=4-1,
=3;

③9
1
4
+9.8+9.25×
1
5

=9.25×(9.8+0.2),
=9.25×10,
=92.5;

④25×(4×11)×7,
=(25×4)×(11×7),
=100×77,
=7700;


⑤(
1
12
+
3
5
)÷
1
60

=(
1
12
+
3
5
)×60,
=60×
1
12
+
3
5
×60,
=5+36,
=41;

⑥101×120-83-37,
=101×120-(83+37),
=120×(101-1),
=120×100,
=12000.
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