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脱式计算.(能简算得要简算.)659-4.8-5.2+749(0.11×537+0.11×247)×4120.8×194-80%×947.2×3.6-7.2×0.641×102.

题目详情
脱式计算.(能简算得要简算.)
6
5
9
-4.8-5.2+7
4
9
   
(0.11×5
3
7
+0.11×2
4
7
)×4
1
2
      
0.8×
19
4
-80%×
9
4
    
7.2×3.6-7.2×0.6     
41×102.
▼优质解答
答案和解析
(1)6
5
9
-4.8-5.2+7
4
9
  
=(6
5
9
+7
4
9
)-(4.8+5.2)
=14-10
=4

(2)(0.11×5
3
7
+0.11×2
4
7
)×4
1
2

=0.11×(5
3
7
+2
4
7
)×4
1
2

=0.11×8×
9
2

=3.96
      
(3)0.8×
19
4
-80%×
9
4

=0.8×
19
4
-0.8×
9
4

=0.8×(
19
4
-
9
4

=0.8×
5
2

=2
    
(4)7.2×3.6-7.2×0.6 
=7.2×(3.6-0.6)
=7.2×3
=21.6
    
(5)41×102
=41×(100+2)
=41×100+41×2
=4100+82
=4182