(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.8+12.5的简便计算.
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![(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.8+12.5的简便计算.](/uploads/image/z/133864-16-4.jpg?t=%EF%BC%881%EF%BC%891.25%2A6.4%2A7%EF%BC%882%EF%BC%899.9%2A7.8%2B0.78%EF%BC%883%EF%BC%890.77%2F0.55%EF%BC%884%EF%BC%897.5%2A1.02%EF%BC%885%EF%BC%893.7%2A2.8%2B12.5%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97.)
(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.8+12.5的简便计算.
(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.8+12.5的简便计算.
(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.8+12.5的简便计算.
(1)1.25*6.4*7
=1.25*0.8*8*7
=1*56
=56
(2)9.9*7.8+0.78
=99*0.78+0.78
=0.78*(99+1)
=78
(3)0.77/0.55
=0.11*7/0.11*5
=7/5
(4)7.5*1.02
=7.5*(1+0.02)
=7.5+7.5*0.02
=7.2+0.15
=7.35
(5)3.7*2.8+12.5
=3.7*(3-0.2)+12.5
=11.1-0.74+12.5
=23.6-0.74
=22.86
(1)1.25*6.4*7
=1.25*0.8*8*7
=1*56
=56
(2)9.9*7.8+0.78
=99*0.78+0.78
=0.78*(99+1)
=78
(3)0.77/0.55
=0.11*7/0.11*5
=7/5
(4)7.5*1.02
=7.5*(1+0.02)
=7.5...
全部展开
(1)1.25*6.4*7
=1.25*0.8*8*7
=1*56
=56
(2)9.9*7.8+0.78
=99*0.78+0.78
=0.78*(99+1)
=78
(3)0.77/0.55
=0.11*7/0.11*5
=7/5
(4)7.5*1.02
=7.5*(1+0.02)
=7.5+7.5*0.02
=7.2+0.15
=7.35
(5)3.7*2.8+12.5
=3.7*(3-0.2)+12.5
=11.1-0.74+12.5
=23.6-0.74
=22.86
收起