小学计算题
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http://zhidao.baidu.com/question/309963519.html?fr=im100009
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1.
1/21+202/2121+50505/212121+13131313/21212121
=1/21+(2*101)/(21*101)+(5*10101)/(21*10101)+(13*1010101)/(21*1010101)
=1/21+2/21+5/21+13/21
=(1+2+5+13)/21
=21/21
=1
2.
(7/16×2又2/3+1/7)/(12又1/3-3又3/4÷5/14)×(1又10/11)
=(7/16×8/3+1/7)/(12又1/3-15/4÷5/14)×21/11
=(7/6+1/7)÷(12又1/3-21/2)×21/11
=(49/42+6/42)÷11/6×21/11
=55/42×6/11×21/11
=5×21/(7×11)
=15/11
1/21+202/2121+50505/212121+13131313/21212121
=1/21+(2*101)/(21*101)+(5*10101)/(21*10101)+(13*1010101)/(21*1010101)
=1/21+2/21+5/21+13/21
=(1+2+5+13)/21
=21/21
=1
2.
(7/16×2又2/3+1/7)/(12又1/3-3又3/4÷5/14)×(1又10/11)
=(7/16×8/3+1/7)/(12又1/3-15/4÷5/14)×21/11
=(7/6+1/7)÷(12又1/3-21/2)×21/11
=(49/42+6/42)÷11/6×21/11
=55/42×6/11×21/11
=5×21/(7×11)
=15/11
来自:求助得到的回答
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