tính hợp li 71/38/45-(43/8/45-1/17/57)
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\(71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)
\(=71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)
\(=28\dfrac{2}{3}+1\dfrac{17}{57}=\dfrac{86}{3}+\dfrac{74}{47}=\dfrac{1708}{57}\)
Chúc bạn học tốt!!!
\(B=71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)
\(B=71\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)
\(B=\left(71\dfrac{38}{45}-43\dfrac{8}{45}\right)+1\dfrac{17}{57}\)
\(B=28\dfrac{2}{3}+1\dfrac{17}{57}\)
\(B=29\dfrac{55}{57}\)
=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
\(71\frac{38}{45}-\left(43\frac{8}{45}-1\frac{17}{57}\right)\)
\(=71\frac{38}{45}-43\frac{8}{45}+1\frac{17}{57}\)
\(=\frac{86}{3}+\frac{74}{57}\)
\(=\frac{1708}{57}\)
Hc tốt #
a: \(A=49+\dfrac{8}{23}-14-\dfrac{8}{23}-5-\dfrac{7}{32}=30-\dfrac{7}{32}=\dfrac{953}{32}\)
b:
Sửa đề: \(B=71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{51}\right)\)
\(B=71+\dfrac{38}{45}-43-\dfrac{8}{45}+1+\dfrac{17}{51}\)
\(=71-43+1+1\)
=28+2=30
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
\(A=71\frac{38}{45}-\left(43\frac{8}{45}+1\frac{17}{57}\right)\)
\(A=\frac{3233}{45}-\left(\frac{1943}{45}+\frac{74}{57}\right)\)
\(A=\frac{3233}{45}-\frac{1943}{45}-\frac{74}{57}\)
\(A=\frac{86}{3}-\frac{74}{57}=\frac{520}{19}\)
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