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计算,能简算的要简算(1)10×23×35×310(2)23.4×39+39×76.6(3)137×45+247×45+45(4)5400-2940÷28×2.

题目详情
计算,能简算的要简算 
(1)10×
2
3
×
3
5
×
3
10
               
(2)23.4×39+39×76.6
(3)1
3
7
×
4
5
+2
4
7
×
4
5
+
4
5
        
(4)5400-2940÷28×2.
▼优质解答
答案和解析
(1)10×
2
3
×
3
5
×
3
10
   
=(10×
3
10
)×(
2
3
×
3
5

=3×
2
5

=
6
5

       
(2)23.4×39+39×76.6
=39×(23.4+76.6)
=39×100
=3900;

(3))1
3
7
×
4
5
+2
4
7
×
4
5
+
4
5
     
=
4
5
×(1
3
7
+2
4
7
+1)
=
4
5
×5
=4;

(4)5400-2940÷28×2
=5400-105×2
=5400-210
=5190.