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计算(能简算的要写出简算过程)①7968-2968÷28×27②5.47-359+3.63-249③(8.8-23.4×13)÷59④0.3×149+659×310⑤12.5×2.5×12×83⑥[1.6-(65−415)×37]÷23.

题目详情
计算(能简算的要写出简算过程)
①7968-2968÷28×27             
②5.47-3
5
9
+3.63-2
4
9

③(8.8-23.4×
1
3
)÷
5
9
         
 ④0.3×1
4
9
+6
5
9
×
3
10

⑤12.5×2.5×12×
8
3
          
 ⑥[1.6-(
6
5
4
15
)×
3
7
2
3
▼优质解答
答案和解析

①7968-2968÷28×27,
=7968-106×27,
=7968-2862,
=5106;

②5.47-3
5
9
+3.63-2
4
9

=(5.47+3.63)-(3
5
9
+2
4
9
),
=9-6,
=3;

③(8.8-23.4×
1
3
)÷
5
9

=(8.8-7.8)÷
5
9

=1÷
5
9

=
9
5


 ④0.3×1
4
9
+6
5
9
×
3
10

=0.3×1
4
9
+6
5
9
×0.3,
=0.3×(1
4
9
+6
5
9
),
=0.3×8,
=2.4;

⑤12.5×2.5×12×
8
3

=12.5×2.5×(4×8),
=(12.5×8)×(2.5×4),
=100×10,
=1000;

⑥[1.6-(
6
5
4
15
)×
3
7
2
3

=[1.6-
14
15
×
3
7
2
3

=[1.6-0.4]÷
2
3

=1.2÷
2
3

=1.8.