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用递等式计算,能简算的要简算.3.4×1.25+1.25×4.625×3.2×12.5(910+35)×(29-215)35÷[(56-23)×3]34-23×(58-12)(12-310)×(2-13)

题目详情
用递等式计算,能简算的要简算.
3.4×1.25+1.25×4.6           

25×3.2×12.5

9
10
+
3
5
)×(
2
9
-
2
15
)           
35÷[(
5
6
-
2
3
)×3]
3
4
-
2
3
×(
5
8
-
1
2
)               
1
2
-
3
10
)×(2-
1
3
▼优质解答
答案和解析
(1)3.4×1.25+1.25×4.6   
=1.25×(4.6+3.4)
=1.25×8
=10


(2)25×3.2×12.5
=25×(8×0.4)×12.5
=(25×0.4)×(12.5×8)
=10×100
=1000

(3)(
9
10
+
3
5
)×(
2
9
-
2
15
)    
=
15
10
×
4
45

=
2
15
    


(4)35÷[(
5
6
-
2
3
)×3]
=35÷[
1
6
×3]
=35÷
1
2

=35×2
=70

(5)
3
4
-
2
3
×(
5
8
-
1
2
)  
=
3
4
-
2
3
×
1
8

=
3
4
-
1
12

=
2
3
  

(6)(
1
2
-
3
10
)×(2-
1
3

=(
5
10
-
3
10
)×
5
3

=
2
10
×
5
3

=
1
3