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这四道题的详细过程。谢谢。
2个回答
2017-09-23 · 知道合伙人教育行家
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55×55/56
=(56-1)×55/56
=56×55/56-1×55/56
=55-55/56
=54又1/56
5/8+5/8×15
=5/8×(1+15)
=5/8×16
=10
1/3×6/7+2/3×6/7
=(1/3+2/3)×6/7
=1×6/7
=6/7
4/5×1/7+2又4/5×3/7
=4/35+6/5
=1又11/35
=(56-1)×55/56
=56×55/56-1×55/56
=55-55/56
=54又1/56
5/8+5/8×15
=5/8×(1+15)
=5/8×16
=10
1/3×6/7+2/3×6/7
=(1/3+2/3)×6/7
=1×6/7
=6/7
4/5×1/7+2又4/5×3/7
=4/35+6/5
=1又11/35
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