用简便方法谢谢
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(a+b)x(c+d)x(e-f)=(5+0.4)x(8+0.5)x(3-0.3)
=(5x8+0.4x8+5x0.5+0.4x0.5)x(3-0.3)
=(40+3.2+2.5+0.2)x(3-0.3)
=45.9x(3-0.3)
=(46-0.1)x(3-0.3)
=46x3-0.1x3-46x0.3+0.1x0.3
=138-0.3-13.8+0.03
=123.93
=(5x8+0.4x8+5x0.5+0.4x0.5)x(3-0.3)
=(40+3.2+2.5+0.2)x(3-0.3)
=45.9x(3-0.3)
=(46-0.1)x(3-0.3)
=46x3-0.1x3-46x0.3+0.1x0.3
=138-0.3-13.8+0.03
=123.93
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