简便运算:4/11*(2/5-1/4)

问题描述:

简便运算:4/11*(2/5-1/4)

4/11*(2/5-1/4)
=4/11*2/5-4/11*1/4
=1/11*8/5-1/11
=1/11*(8/5-1)
=1/11*3/5
=3/55

=4/11*(8/20-5/20)
=4/11* 3/20
=3/55

4/11*(2/5-1/4)
=4/11×(2/5)-4/11×(1/4)
=8/55-1/11
=8/55-5/55
=3/55;
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原式=4/11*2/5-4/11*1/4=3/55