(1)
4
5
÷
1
5
×
1
4
               
(2)
5
12
÷(1÷
3
4
)      
(3)(
1
2
-
3
8
)×8.
分析:(1)先算除法,再算乘法;
(2)先算小括號(hào)里面的除法,再算括號(hào)外面的除法;
(3)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算.
解答:解:(1)
4
5
÷
1
5
×
1
4

=4×
1
4

=1;

(2)
5
12
÷(1÷
3
4

=
5
12
÷
4
3

=
5
16


(3)(
1
2
-
3
8
)×8
=
1
2
×8-
3
8
×8
=4-3
=1.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡(jiǎn)便計(jì)算.
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