我是数学白痴一枚 45x2.08+1.5x37.652x11.1+2.6x77848x1.08+1.2x5
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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
45x2.08+1.5x37.6
52x11.1+2.6x778
48x1.08+1.2x56.8
72x2.09-1.8x73.6
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
=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
1x2+2x3+3x4+4x5+……+10x11
毕竟我是数学白痴呀.
因式分解:X15+X14+X13+X12+X11+X10+X9+X8+X7+X6+X5+X4+X3+X2+X+1
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