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A=71 38/45-(43 8/45 + 1 17/57)
=( 71 38/45-43 8/45 )+ 1 17/57
= 28 2/3 + 1 17/57
= 29 55/57
\(A=71\frac{38}{45}-\left(43\frac{8}{45}+1\frac{17}{57}\right)\)
\(A=\frac{3233}{45}-\left(\frac{1943}{45}+\frac{74}{57}\right)\)
\(A=\frac{3233}{45}-\frac{1943}{45}-\frac{74}{57}\)
\(A=\frac{86}{3}-\frac{74}{57}=\frac{520}{19}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
giải
71/38/45-(43/8/45-1/17/57)
=71/38/45-43/8/45+1/17/57
=28/30/45+1/17/57
=1708/57
![](https://rs.olm.vn/images/avt/0.png?1311)
\(71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)
\(=71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)
\(=28\dfrac{2}{3}+1\dfrac{17}{57}=\dfrac{86}{3}+\dfrac{74}{47}=\dfrac{1708}{57}\)
Chúc bạn học tốt!!!
\(B=71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)
\(B=71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)
\(B=\left(71\dfrac{38}{45}-43\dfrac{8}{45}\right)+1\dfrac{17}{57}\)
\(B=28\dfrac{2}{3}+1\dfrac{17}{57}\)
\(B=29\dfrac{55}{57}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
=71+38/45- 43+8/45 +1+17/57
=(71 \(\frac{38}{45}-43\frac{8}{45}\))+ 1+17/57=28+2/3+1+17/57=29+55/57=29/55/57
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(71\frac{38}{45}-\left(43\frac{8}{45}-1\frac{17}{57}\right)\)
\(=71\frac{38}{45}-43\frac{8}{45}+1\frac{17}{57}\)
\(=\frac{86}{3}+\frac{74}{57}\)
\(=\frac{1708}{57}\)
Hc tốt #
sao bạn lại ngăn cách giữa các số vậy,nó là -713845 hay là -71 x 38 x 45