题目内容

能简算的要简算.
7
8
×(1-75%)+
1
4
+0.25×
1
8
2
7
+
1
5
)×7×5
7.89×16.5+21.1×1.65
5
11
×[(
2
5
+
1
3
)÷
5
6
].
(1)
7
8
×(1-75%)+
1
4
+0.25×
1
8

=
7
8
×(1-
3
4
)+
1
4
+
1
4
×
1
8

=
7
8
×
1
4
+
1
4
+
1
4
×
1
8

=(
7
8
+1+
1
8
)×
1
4

=2×
1
4

=
1
2


(2)(
2
7
+
1
5
)×7×5
=
2
7
×7×5+
1
5
×7×5
=10+7
=17;

(3)7.89×16.5+21.1×1.65
=78.9×16.5+21.1×1.65
=(78.9+21.1)×16.5
=100×16.5
=1650;

(4)
5
11
×[(
2
5
+
1
3
)÷
5
6
]
=
5
11
×[
11
15
×
6
5
]
=
5
11
×
11
15
×
6
5

=
2
5
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