3.7×8.3+0.83
=3.7×8.3+0.1×8.3
=（3.7+0.1）×8.3
=3.8×8.3
=31.54
2.56×0.3+7×0.256
=2.56×0.3+7×0.1×2.56
=2.56×（0.3+0.7）
=2.56×1
=2.56
27×10.5-2.7×0.5
=27×10+27×0.5-27×0.05
=27+13.5-1.35
=39.15
3.7*8.3+0.83=3.7*8.3+8.3*0.1=8.3*（3.7+0.1）=8.3*3.8
3.7x8.3+0.83
=3.7x8.3+8.3x0.1
=（3.7-0.1）x8.3
=3.6x8.3
=29.88
=0.83*37+0.83
=0.83*(37+1)
=0.83*(40-2)
=0.83*40-0.83*2
=33,2-1.66
=31.54
8.3=0.83×10,提公因数。
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