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脱式计算(能简算的要简算)20.9+10.5÷(5.2-3.5)3.5×0.7+5.5×0.7+0.76.2×9.99.83×(3.8-2.3)+1.5×6.1721÷0.25÷0.40.125×3.2×0.25.
题目详情
脱式计算(能简算的要简算)
20.9+10.5÷(5.2-3.5)
3.5×0.7+5.5×0.7+0.7
6.2×9.9
9.83×(3.8-2.3)+1.5×6.17
21÷0.25÷0.4
0.125×3.2×0.25.
20.9+10.5÷(5.2-3.5)
3.5×0.7+5.5×0.7+0.7
6.2×9.9
9.83×(3.8-2.3)+1.5×6.17
21÷0.25÷0.4
0.125×3.2×0.25.
▼优质解答
答案和解析
(1)20.9+10.5÷(5.2-3.5)
=20.9+10.5÷1.7
=20.9+6
=27
;
(2)3.5×0.7+5.5×0.7+0.7
=(3.5+5.5+1)×0.7
=10×0.7
=7;
(3)6.2×9.9
=6.2×(10-0.1)
=6.2×10-6.2×0.1
=62-0.62
=61.38;
(4)9.83×(3.8-2.3)+1.5×6.17
=9.83×1.5+1.5×6.17
=(9.83+6.17)×1.5
=16×1.5
=24;
(5)21÷0.25÷0.4
=21÷(0.25×0.4)
=21÷0.1
=210;
(6)0.125×3.2×0.25
=0.125×8×0.4×0.25
=(0.125×8)×(0.4×0.25)
=1×0.1
=0.1.
=20.9+10.5÷1.7
=20.9+6
3 |
17 |
=27
13 |
170 |
(2)3.5×0.7+5.5×0.7+0.7
=(3.5+5.5+1)×0.7
=10×0.7
=7;
(3)6.2×9.9
=6.2×(10-0.1)
=6.2×10-6.2×0.1
=62-0.62
=61.38;
(4)9.83×(3.8-2.3)+1.5×6.17
=9.83×1.5+1.5×6.17
=(9.83+6.17)×1.5
=16×1.5
=24;
(5)21÷0.25÷0.4
=21÷(0.25×0.4)
=21÷0.1
=210;
(6)0.125×3.2×0.25
=0.125×8×0.4×0.25
=(0.125×8)×(0.4×0.25)
=1×0.1
=0.1.
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