
(简便计算)那位好心人帮帮忙,给好评!
2013-12-21 · 知道合伙人教育行家
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1、13-13×16/17
=13×(1-16/17)
=13×1/17
=13/17
2、1-6/11÷21/22-3/7
=1-4/7-3/7
=1-(4/7+3/7)
=1-1
=0
3、3/5×1/4+2/5÷4
=3/5×1/4+2/5×1/4
=(3/5+2/5)×1/4
=1×1/4
=1/4
4、8/9×[3/4÷(1/3+1/5)]
=8/9×[3/4÷8/15]
=8/9×15/32
=5/12
=13×(1-16/17)
=13×1/17
=13/17
2、1-6/11÷21/22-3/7
=1-4/7-3/7
=1-(4/7+3/7)
=1-1
=0
3、3/5×1/4+2/5÷4
=3/5×1/4+2/5×1/4
=(3/5+2/5)×1/4
=1×1/4
=1/4
4、8/9×[3/4÷(1/3+1/5)]
=8/9×[3/4÷8/15]
=8/9×15/32
=5/12
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