简便计算.3.78×99+3.78 42.2×103 8.3×99 0.125×3.20.25
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![简便计算.3.78×99+3.78 42.2×103 8.3×99 0.125×3.20.25](/uploads/image/z/14492334-30-4.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97.3.78%C3%9799%2B3.78+42.2%C3%97103+8.3%C3%9799+0.125%C3%973.20.25)
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简便计算.3.78×99+3.78 42.2×103 8.3×99 0.125×3.20.25
简便计算.
3.78×99+3.78 42.2×103 8.3×99 0.125×3.20.25
简便计算.3.78×99+3.78 42.2×103 8.3×99 0.125×3.20.25
3.78×99+3.78
=3.78×(99+1)
=3.78×100
=378
42.2×103
=42.2×(100+3)
=42.2×100+42.2×3
=4220+126.6
=4346.6
8.3×99
=8.3×(100-1)
=8.3×100-8.3
=830-8.3
=821.7
0.125×3.2×0.25
=0.125×8×(0.4×0.25)
=1×0.1
=0.1