tính bằng cách thuận tiện 7/11 + 3/4 + 4/11 + 1/4 giúp tớ với
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Tính bằng cách thuận tiện nhất:
9/4 x 15/11 + 3/4 : 11/7 - 3/4 x 8/11
[Lưu ý trình bày cách làm ra!]
\(\dfrac{9}{4}\times\dfrac{15}{11}+\dfrac{3}{4}:\dfrac{11}{7}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times3\times\dfrac{15}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\dfrac{45}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\left(\dfrac{45}{11}+\dfrac{7}{11}-\dfrac{8}{11}\right)\)
\(=\dfrac{3}{4}\times4\)
\(=3\)
`9/4xx15/11+3/4:11/7-3/4xx8/11`
`=3/4xx15/11xx3+3/4xx7/11-3/4xx8/11`
`=3/4xx45/11+3/4xx7/11-3/4xx8/11`
`=3/4xx(45/11+7/11-8/11)`
`=3/4xx4`
`=3`
\(\left(\dfrac{7}{11}+\dfrac{4}{11}\right):\dfrac{3}{5}=\dfrac{11}{11}:\dfrac{3}{5}=\dfrac{1}{1}:\dfrac{3}{5}=\dfrac{1}{1}\times\dfrac{5}{3}=\dfrac{5}{3}\)
\(=\dfrac{11}{12}\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right)=\dfrac{11}{12}\cdot1=\dfrac{11}{12}\)
=(1/11+10/11)+(2/11+9/11)+(3/11+8/11)+(4/11+7/11)+(5/11+6/11)
=11/11+11/11+11/11+11/11+11/11
=1+1+1+1+1
=5
\(\dfrac{14}{21}\times\dfrac{2}{11}+\dfrac{1}{11}:\dfrac{3}{2}+\dfrac{2}{3}:\dfrac{11}{4}+\dfrac{4}{11}\times\dfrac{16}{24}\\ =\dfrac{2}{3}\times\dfrac{2}{11}+\dfrac{1}{11}\times\dfrac{2}{3}+\dfrac{2}{3}\times\dfrac{4}{11}+\dfrac{4}{11}\times\dfrac{2}{3}\\ =\dfrac{2}{3}\times\left(\dfrac{2}{11}+\dfrac{1}{11}+\dfrac{4}{11}+\dfrac{4}{11}\right)\\ =\dfrac{2}{3}\times\dfrac{2+1+4+4}{11}\\ =\dfrac{2}{3}\times\dfrac{11}{11}=\dfrac{2}{3}\times1=\dfrac{2}{3}\)
7/11+3/4+4/11+1/4=(7/11+4/11)+(3/4+1/4)=1+1=2 nha
7/11+3/4+4/11+1/4= (7/11+4/11)+(3/4+1/4)
=11/11+4/4=1+1=2
Chúc bạn học tốt!