2018-07-06
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(2)24:00-23:12=48分钟 0:00+11:34=11小时34分钟 48分钟+11小时34分钟=12小时22分钟
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1-(2/7)-(3/7)=(7-2-3)/7=2/7;
(3/7)+(5/9)-(2/9)
=(3/7)+(3/9)=(3/7)+(1/3)
=(9/21)+(7/21)=16/21;
(12/11)÷(25/51)
=(12/11)×(51/21)
=(4/11)×(51/7)
=(4×51)/(11×7)=204/77;
(8/15)-(1/5)+(1/3)
=(8/15)-(3/15)+(5/15)
=(8-3+5)/15=10/15=2/3;
(7/10)-[(3/4)-(3/10)]
=(7/10)-(3/4)+(3/10)
=(7/10)+(3/10)-(3/4)
=1-(3/4)=1/4;
(4/7)÷(7/4)=(4/7)×(4/7)=16/49
(3/7)+(5/9)-(2/9)
=(3/7)+(3/9)=(3/7)+(1/3)
=(9/21)+(7/21)=16/21;
(12/11)÷(25/51)
=(12/11)×(51/21)
=(4/11)×(51/7)
=(4×51)/(11×7)=204/77;
(8/15)-(1/5)+(1/3)
=(8/15)-(3/15)+(5/15)
=(8-3+5)/15=10/15=2/3;
(7/10)-[(3/4)-(3/10)]
=(7/10)-(3/4)+(3/10)
=(7/10)+(3/10)-(3/4)
=1-(3/4)=1/4;
(4/7)÷(7/4)=(4/7)×(4/7)=16/49
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