用简便方法计算下面各题。4.8x0.25 0.78x98 0.5x2
用简便方法计算下面各题。4.8x0.250.78x980.5x2.33x81.5x1050.3x2.5x0.41.2x2.5+0.8x2.5...
用简便方法计算下面各题。4.8x0.25 0.78x98 0.5x2.33x8 1.5x105 0.3x2.5x0.4 1.2x2.5+0.8x2.5
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4.8x0.25
=1.2×(4×0.25)
=1.2×1
=1.2
0.78x98
=0.78×(100-1)
=0.78×100-0.78
=78-0.78
=77.22
0.5x2.33x8
=(0.5×8)×2.33
=4×2.33
=9.32
1.5x105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5
0.3x2.5x0.4
=0.3×(2.5×0.4)
=0.3×1
=0.3
1.2x2.5+0.8x2.5
=(1.2+0.8)×2.5
=2×2.5
=5
=1.2×(4×0.25)
=1.2×1
=1.2
0.78x98
=0.78×(100-1)
=0.78×100-0.78
=78-0.78
=77.22
0.5x2.33x8
=(0.5×8)×2.33
=4×2.33
=9.32
1.5x105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5
0.3x2.5x0.4
=0.3×(2.5×0.4)
=0.3×1
=0.3
1.2x2.5+0.8x2.5
=(1.2+0.8)×2.5
=2×2.5
=5
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