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脱式计算.(能用简便方法的用简便方法).17.5-5.15-1.850.8×3.9×1.254.5+5.5×0.065.81+8.3+4.19+11.724.7-13.09+8.60.4×(2.5+0.25)
题目详情
脱式计算.(能用简便方法的用简便方法).
17.5-5.15-1.85 | 0.8×3.9×1.25 | 4.5+5.5×0.06 |
5.81+8.3+4.19+11.7 | 24.7-13.09+8.6 | 0.4×(2.5+0.25 ) |
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答案和解析
(1)17.5-5.15-1.85
=17.5-(5.15+1.85)
=17.5-7
=10.5
(2)0.8×3.9×1.25
=0.8×1.25×3.9
=1×3.9
=3.9
(3)4.5+5.5×0.06
=4.5+0.33
=4.83
(4)5.81+8.3+4.19+11.7
=5.81+4.19+(8.3+11.7)
=10+20
=30
(5)24.7-13.09+8.6
=11.61+8.6
=20.21
(6)0.4×(2.5+0.25)
=0.4×2.5+0.25×0.4
=1+01
=1.1
=17.5-(5.15+1.85)
=17.5-7
=10.5
(2)0.8×3.9×1.25
=0.8×1.25×3.9
=1×3.9
=3.9
(3)4.5+5.5×0.06
=4.5+0.33
=4.83
(4)5.81+8.3+4.19+11.7
=5.81+4.19+(8.3+11.7)
=10+20
=30
(5)24.7-13.09+8.6
=11.61+8.6
=20.21
(6)0.4×(2.5+0.25)
=0.4×2.5+0.25×0.4
=1+01
=1.1
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