第四题简便计算急需要用，
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4.8×0.25
=1.2×4×0.25
=1.2×1
=1.2
0.78×98
=0.78×100-0.78×2
=78-1.56
=76.44
0.5×2.33×8
=0.5×8×2.33
=4×2.33
=9.32
1.5×105
=1.5×100+1.5×5
=150+7.5
=157.5
0.3×2.5×0.4
=0.3×1
=0.3
1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=5
=1.2×4×0.25
=1.2×1
=1.2
0.78×98
=0.78×100-0.78×2
=78-1.56
=76.44
0.5×2.33×8
=0.5×8×2.33
=4×2.33
=9.32
1.5×105
=1.5×100+1.5×5
=150+7.5
=157.5
0.3×2.5×0.4
=0.3×1
=0.3
1.2×2.5+0.8×2.5
=(1.2+0.8)×2.5
=2×2.5
=5
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