计算(1) [(0.05+ 1 4 )÷0.25-40%]× 1 8 (2) [4 1 2 -(0.5+ 1 3

2024-12-29 18:25:31
推荐回答(1个)
回答1:

(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.