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下面各题怎样简便就怎样算.12.78-(4.97+2.78)5.24×10.16.8÷2.5÷40.05×[10.6÷(4.5+0.8)]18.56-3.27+1.44-6.735.3×100+1000×0.17
题目详情
下面各题怎样简便就怎样算.
12.78-(4.97+2.78) | 5.24×10.1 | 6.8÷2.5÷4 |
0.05×[10.6÷(4.5+0.8)] | 18.56-3.27+1.44-6.73 | 5.3×100+1000×0.17 |
▼优质解答
答案和解析
(1)12.78-(4.97+2.78)
=12.78-4.97-2.78
=12.78-2.78-4.97
=10-4.97
=5.03;
(2)5.24×10.1
=5.24×(10+0.1)
=5.24×10+5.24×0.1
=52.4+0.524
=52.924;
(3)6.8÷2.5÷4
=6.8÷(2.5×4)
=6.8÷10
=0.68;
(4)0.05×[10.6÷(4.5+0.8)]
=0.05×[10.6÷5.3]
=0.05×2
=0.1;
(5)18.56-3.27+1.44-6.73
=(18.56+1.44)-(3.27+6.73)
=20-10
=10;
(6)5.3×100+1000×0.17
=5.3×100+100×1.7
=(5.3+1.7)×100
=7×100
=700.
=12.78-4.97-2.78
=12.78-2.78-4.97
=10-4.97
=5.03;
(2)5.24×10.1
=5.24×(10+0.1)
=5.24×10+5.24×0.1
=52.4+0.524
=52.924;
(3)6.8÷2.5÷4
=6.8÷(2.5×4)
=6.8÷10
=0.68;
(4)0.05×[10.6÷(4.5+0.8)]
=0.05×[10.6÷5.3]
=0.05×2
=0.1;
(5)18.56-3.27+1.44-6.73
=(18.56+1.44)-(3.27+6.73)
=20-10
=10;
(6)5.3×100+1000×0.17
=5.3×100+100×1.7
=(5.3+1.7)×100
=7×100
=700.
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