题目内容

脱式计算(能简算的要用简便算法计算).
85×0.75+15×75%
5
12
+
1
19
)×12+
7
19

[1-(
1
3
+
1
4
)]×24.
(1)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75;

(2)(
5
12
+
1
19
)×12+
7
19

=
5
12
×12+
1
19
×12+
7
19

=5+(
12
19
+
7
19
),
=5+1,
=6;

(3)[1-(
1
3
+
1
4
)]×24,
=[1-
7
12
]×24,
=
5
12
×24,
=10.
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