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

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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

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
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

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
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

题目错误无法回答

45x2.08+1.5x37.6=1.5x30x2.08+1.5x37.6=1.5x62.4+1.5x37.6=1.5x(62.4+37.6)=1.5x100=150
52x11.1+2.6x778=2.6x20x11.1+2.6x778=2.6x222+2.6x778=2.6x(222+778)=2600
48x1.08+1.2x56.8=1.2x40x1.08+1.2x56.8...

全部展开

45x2.08+1.5x37.6=1.5x30x2.08+1.5x37.6=1.5x62.4+1.5x37.6=1.5x(62.4+37.6)=1.5x100=150
52x11.1+2.6x778=2.6x20x11.1+2.6x778=2.6x222+2.6x778=2.6x(222+778)=2600
48x1.08+1.2x56.8=1.2x40x1.08+1.2x56.8=1.2x43.2+1.2x56.8=120
72x2.09-1.8x73.6=1.8x40x2.09-1.8x73.6=1.8x83.6-1.8x73.6=18
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