2又5分之2加1又3分之1乘5的和除以3又5分之2减1又3分之1 的简便运算
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答:依题意得
(2又2/5+5×1又1/3)÷3又2/5-1又1/3
=(12/5+5×4/3)÷17/5-1又1/3
=(12/5+20/3)×5/17-1又
1/3
=12/5×5/17+20/3×5/17-1又1/3
=12/17+100/51-1又1/3
=12/17+(1又49/51-1又
17/51)
=12/17+32/51
=36/51+32/51
=68/51
=4/3
=1又1/3
(2又2/5+5×1又1/3)÷3又2/5-1又1/3
=(12/5+5×4/3)÷17/5-1又1/3
=(12/5+20/3)×5/17-1又
1/3
=12/5×5/17+20/3×5/17-1又1/3
=12/17+100/51-1又1/3
=12/17+(1又49/51-1又
17/51)
=12/17+32/51
=36/51+32/51
=68/51
=4/3
=1又1/3
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