问题标题：
【我是数学白痴一枚45x2.08+1.5x37.652x11.1+2.6x77848x1.08+1.2x56.872x2.09-1.8x73.6用简便运算】
问题描述：
我是数学白痴一枚
45x2.08+1.5x37.6
52x11.1+2.6x778
48x1.08+1.2x56.8
72x2.09-1.8x73.6
用简便运算
李长胜回答：
45x2.08+1.5x37.6
=4.5x20.8+1.5x37.6
=1.5x3x20.8+1.5x37.6
=1.5x(3x20.8+37.6)
=1.5x(62.4+37.6)
=1.5x100
=150
52x11.1+2.6x778
=26x2x11.1+26x77.8
=26x(22.2+77.8)
=26x100
=2600
48x1.08+1.2x56.8
=48x1.08+1.2x40x1.42
=48x(1.08+1.42)
=48x2.5
=12x4x2.5
=12x10
=120
72x2.09-1.8x73.6
=72x2.09-1.8x40x1.84
=72x2.09-72x1.84
=72x(2.09-1.84)
=72x0.25
=18x4x0.25
=18
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