Thực hiện phép tính : a,5/11+23/29+17/11 b,15/28-186/1116-121/462+198/189 09/11/2021 Bởi Clara Thực hiện phép tính : a,5/11+23/29+17/11 b,15/28-186/1116-121/462+198/189
a, $\dfrac{5}{11}+\dfrac{23}{29}+\dfrac{17}{11}$ $=\dfrac{5}{11}+\dfrac{17}{11}+\dfrac{23}{29}$ $=\dfrac{22}{11}+\dfrac{23}{29}$ $=2+\dfrac{23}{29}$ $=\dfrac{81}{29}$ b, $\dfrac{15}{28}-\dfrac{186}{1116}-\dfrac{121}{462}+\dfrac{198}{189}$ $=\dfrac{15}{28}-\dfrac{1}{6}-\dfrac{11}{42}+\dfrac{22}{21}$ $=\dfrac{45}{84}-\dfrac{14}{84}-\dfrac{22}{84}+\dfrac{88}{84}$ $=\dfrac{45-14-22+88}{84}$ $=\dfrac{97}{84}$ Bình luận
Đáp án: a, 5/11+23/29+17/11 =(5/11+17/11)+23/29 =22/11+23/29 =2+23/29 =58/29+23/29 =81/29 b, 15/28-186/1116-121/462+198/189 =15/28-1/6-11/42+22/21 =15/28-1/6+11/14 =45/84-14/84+66/84 =97/84 Bình luận
a, $\dfrac{5}{11}+\dfrac{23}{29}+\dfrac{17}{11}$
$=\dfrac{5}{11}+\dfrac{17}{11}+\dfrac{23}{29}$
$=\dfrac{22}{11}+\dfrac{23}{29}$
$=2+\dfrac{23}{29}$
$=\dfrac{81}{29}$
b, $\dfrac{15}{28}-\dfrac{186}{1116}-\dfrac{121}{462}+\dfrac{198}{189}$
$=\dfrac{15}{28}-\dfrac{1}{6}-\dfrac{11}{42}+\dfrac{22}{21}$
$=\dfrac{45}{84}-\dfrac{14}{84}-\dfrac{22}{84}+\dfrac{88}{84}$
$=\dfrac{45-14-22+88}{84}$
$=\dfrac{97}{84}$
Đáp án:
a, 5/11+23/29+17/11
=(5/11+17/11)+23/29
=22/11+23/29
=2+23/29
=58/29+23/29
=81/29
b, 15/28-186/1116-121/462+198/189
=15/28-1/6-11/42+22/21
=15/28-1/6+11/14
=45/84-14/84+66/84
=97/84