能简算的要简算. (3/4-3/4×2/5)÷1/5 (2/3-1/2+1/6)÷1/24 7.28÷0.8÷12.5 1.28×2.37-2.8×0.237 0.65×14+87×65%-13/20

能简算的要简算. (3/4-3/4×2/5)÷1/5 (2/3-1/2+1/6)÷1/24 7.28÷0.8÷12.5 1.28×2.37-2.8×0.237 0.65×14+87×65%-13/20

题目
能简算的要简算.
3
4
答案
(1)(
3
4
-
3
4
×
2
5
)÷
1
5

=[(1-
2
5
)×
3
4
]×5,
=
3
5
×
3
4
×5,
=
9
4

(2)(
2
3
-
1
2
+
1
6
)÷
1
24

=
1
3
×24,
=8;
(3)7.28÷0.8÷12.5,
=7.28÷(0.8×12.5),
=7.28÷10,
=0.728;
(4)1.28×2.37-2.8×0.237,
=1.28×2.37-0.28×2.37,
=(1.28-0.28)×2.37,
=1×2.37,
=2.37;
(5)0.65×14+87×65%-
13
20

=0.65×14+87×0.65-0.65,
=0.65×(14+87-1),
=0.65×100,
=65.
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