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=43/12-16/6.(20/32+7/32)
=43/12-16/6.27/32
=43/12-9/4
=43/12-27/12
=4/3
43/12-16/6x[5/8+7/32]
=43/12-16/6x[20/32+7/32]
=43/12-16/6x27/32
=43/12-432/192
=688/192-432-192
=256/192=4/3
\(\dfrac{7}{5}+\dfrac{4}{7}-\dfrac{9}{10}=\dfrac{49-20}{35}-\dfrac{9}{10}=\dfrac{19}{35}-\dfrac{9}{10}=\dfrac{190-315}{350}=\dfrac{-125}{350}\)
\(\dfrac{2}{1}+\dfrac{3}{4}\text{×}\dfrac{8}{5}=\dfrac{8+3}{4}\text{×}\dfrac{8}{5}=\dfrac{11\text{×}8}{4\text{×}5}=\dfrac{88}{20}\)
mấy câu kia áp dụng là dc!
Bài làm :
\(\frac{5}{6}\times\frac{8}{7}\)
\(=\frac{5\times4\times2}{2\times3\times7}\)
\(=\frac{20}{21}\)
Học tốt nhé
\(\frac{3}{2}+\frac{7}{6}+\frac{13}{12}+...+\frac{73}{72}\)
\(=1+\frac{1}{2}+1+\frac{1}{6}+1+\frac{1}{13}+...+1+\frac{1}{72}\)
\(=8+\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{72}\right)\)
\(=8+\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{8.9}\right)\)
\(=8+\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{8}-\frac{1}{9}\right)\)
\(=8+1-\frac{1}{9}=8\frac{8}{9}\)
\(\frac{3}{2}+\frac{7}{6}+\frac{13}{12}+...+\frac{73}{72}\)
\(=1+\frac{1}{2}+1+\frac{1}{6}+...+1+\frac{1}{72}\)
\(=\left(1+1+...+1\right)+\left(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{8.9}\right)\)
\(=8+1-\frac{1}{9}\)
\(=9-\frac{1}{9}=\frac{80}{9}\)
\(\dfrac{6}{7}+\dfrac{12}{5}:\dfrac{8}{7}\)
\(=\dfrac{6}{7}+\dfrac{12}{5}\times\dfrac{7}{8}\)
\(=\dfrac{6}{7}+\dfrac{84}{40}\)
\(=\dfrac{240}{280}+\dfrac{588}{280}\)
\(=\dfrac{828}{280}\)
12/5chia8/7 bằng 12/5 x 7/8 bằng 96/35 6/7+96/35 bằng 126/35