5X1.03X0.2、32X1.25、0.45X99、53X10.1、4.2X6.51+3.49X4.2、9.99X1.53+3.33X3.4用简便计算，详细清楚！
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5X1.03X0.2
=(5x0.2)x1.03
=1x1.03
=1.03
32X1.25
=4x(8x1.25)
=4x10
=40
0.45X99
=0.45x(100-1)
=0.45x100-0.45
=45-0.45
=44.55
53X10.1
=53x(10+0.1)
=53x10+53x0.1
=530+5.3
=535.3
4.2X6.51+3.49X4.2
=4.2x(6.51+3.49)
=4.2x10
=42
9.99X1.53+3.33X3.41
=3.33x4.59+3.33x3.41
=3.33x(4.59+3.41)
=3.33x8
=26.64
=(5x0.2)x1.03
=1x1.03
=1.03
32X1.25
=4x(8x1.25)
=4x10
=40
0.45X99
=0.45x(100-1)
=0.45x100-0.45
=45-0.45
=44.55
53X10.1
=53x(10+0.1)
=53x10+53x0.1
=530+5.3
=535.3
4.2X6.51+3.49X4.2
=4.2x(6.51+3.49)
=4.2x10
=42
9.99X1.53+3.33X3.41
=3.33x4.59+3.33x3.41
=3.33x(4.59+3.41)
=3.33x8
=26.64
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