题目内容

计算
(1)[(0.05+
1
4
)÷0.25-40%]×
1
8

(2)[4
1
2
-(0.5+
1
3
5
27
]×0.125

(3)6.4×1.3+1÷
10
13
+
13
10
×
13
5

(4)7.4×
5
4
+125%×2.5+
5
4
÷10
(1)[(0.05+
1
4
)÷0.25-40%]×
1
8

=[(0.05+0.25)÷0.25-40%]×
1
8

=[0.3÷0.25-40%]×
1
8

=[1.2-0.4]×
1
8

=0.8×
1
8

=0.1;

(2)[4
1
2
-(0.5+
1
3
5
27
]×0.125

=[4
1
2
-(
1
2
+
1
3
)×
27
5
]×0.125,
=[4
1
2
-
5
6
×
27
5
]×0.125,
=[4
1
2
-4
1
2
]×0.125,
=0×0.125,
=0;

(3)6.4×1.3+1÷
10
13
+
13
10
×
13
5

=6.4×1.3+1×1.3+1.3×2.6,
=(6.4+1+2.6)×1.3,
=10×1.3,
=13;

(4)7.4×
5
4
+125%×2.5+
5
4
÷10

=7.4×1.25+1.25×2.5+1.25×0.1,
=(7.4+2.5+0.1)×1.25,
=10×1.25,
=12.5.
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