题目内容

能简算的要简算:
(1)241×690÷339÷345×678÷241
(2)6-0.65+5
7
20
×99
(3)356×84
1
4
-4
1
4
×356-80÷
1
356

(4)[3.75-(0.2+
1
3
)×4
1
2
]÷13.5%
(1)241×690÷339÷345×678÷241,
=241×690×
1
339
×
1
345
×678×
1
241

=(241×
1
241
)×(
1
339
×678)×(690×
1
345
),
=1×2×2,
=4;

(2)6-0.65+5
7
20
×99,
=5.35+5.35×99,
=(1+99)×5.35,
=100×5.35,
=535;

(3)356×84
1
4
-4
1
4
×356-80÷
1
356

=356×84
1
4
-4
1
4
×356-80×356,
=356×(84
1
4
-4
1
4
-80),
=356×0,
=0;

(4)[3.75-(0.2+
1
3
)×4
1
2
]÷13.5%,
=[3
3
4
-(
1
5
+
1
3
)×4
1
2
]÷13.5%,
=[3
3
4
-
8
15
×
9
2
]÷13.5%,
=[
15
4
-
12
5
]÷13.5%,
=
27
20
÷13.5%,
=1.35÷0.135,
=10.
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