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计算(能简算的要简算)4×8×1.25×25%37.5%+(425+58)1.8×14+2.2×25%38×0.3+0.7×0.375245−(2.8+57)2.5×310+7.5÷103.

题目详情
计算(能简算的要简算)
4×8×1.25×25%       
37.5%+(
4
25
+
5
8
)     
1.8×
1
4
+2.2×25%
3
8
×0.3+0.7×0.375  
24
5
−(2.8+
5
7
)    
2.5×
3
10
+7.5÷
10
3
▼优质解答
答案和解析
(1)4×8×1.25×25%,
=(4×25%)×(8×1.25),
=1×10,
=10;

(2)37.5%+(
4
25
+
5
8
),
=
3
8
+(
4
25
+
5
8
),
=(
3
8
+
5
8
)+
4
25

=1+
4
25

=1
4
25


(3)1.8×
1
4
+2.2×25%,
=(1.8+2.2)×
1
4

=4×
1
4

=1;

(4)
3
8
×0.3+0.7×0.375,
=0.375×0.3+0.7×0.375,
=0.375×(0.3+0.7),
=0.375×1,
=0.375;

(5)
24
5
-(2.8+
5
7
),
=
24
5
-
14
5
-
5
7

=2-
5
7

=1
2
7


(6)2.5×
3
10
+7.5÷
10
3

=2.5×
3
10
+7.5×
3
10

=(2.5+7.5)×
3
10

=10×
3
10

=3.