(-1/4 +7/33 -5/3) – (-15/4 +6/11 – 48/49) 23/08/2021 Bởi Autumn (-1/4 +7/33 -5/3) – (-15/4 +6/11 – 48/49)
Đáp án: $\dfrac{243}{98}$ Giải thích các bước giải: $(\dfrac{-1}{4}+\dfrac{7}{33}-\dfrac{5}{3})-(-\dfrac{15}{4}+\dfrac{6}{11}-\dfrac{48}{49})$ Cách làm:Phá ngoặc $=\dfrac{-1}{4}+\dfrac{7}{33}-\dfrac{5}{3}+\dfrac{15}{4}-\dfrac{6}{11}+\dfrac{48}{49}$ $=(\dfrac{-1}{4}+\dfrac{15}{4})+(\dfrac{7}{33}-\dfrac{5}{3}-\dfrac{6}{11})+\dfrac{48}{49}$ Cách làm:Quy đồng $=\dfrac{-1+15}{4}+(\dfrac{7-55-18}{33}+\dfrac{48}{49}$ $=\dfrac{7}{2}+(-2)+\dfrac{48}{49}$ Cách làm:Quy đồng $=\dfrac{343+(-196)+96}{98}$ $=\dfrac{243}{98}$ Bình luận
`(-1/4+7/33-5/3)-(-15/4+6/11-48/49)` `=-1/4+7/33-5/3+15/4-6/11+48/49` `=-1/4+15/4+7/33-5/3-6/11+48/49` `=14/4-66/33+48/49` `=7/2-2+48/49` `=3/2+48/49` `=243/98` Bình luận
Đáp án:
$\dfrac{243}{98}$
Giải thích các bước giải:
$(\dfrac{-1}{4}+\dfrac{7}{33}-\dfrac{5}{3})-(-\dfrac{15}{4}+\dfrac{6}{11}-\dfrac{48}{49})$
Cách làm:Phá ngoặc
$=\dfrac{-1}{4}+\dfrac{7}{33}-\dfrac{5}{3}+\dfrac{15}{4}-\dfrac{6}{11}+\dfrac{48}{49}$
$=(\dfrac{-1}{4}+\dfrac{15}{4})+(\dfrac{7}{33}-\dfrac{5}{3}-\dfrac{6}{11})+\dfrac{48}{49}$
Cách làm:Quy đồng
$=\dfrac{-1+15}{4}+(\dfrac{7-55-18}{33}+\dfrac{48}{49}$
$=\dfrac{7}{2}+(-2)+\dfrac{48}{49}$
Cách làm:Quy đồng
$=\dfrac{343+(-196)+96}{98}$
$=\dfrac{243}{98}$
`(-1/4+7/33-5/3)-(-15/4+6/11-48/49)`
`=-1/4+7/33-5/3+15/4-6/11+48/49`
`=-1/4+15/4+7/33-5/3-6/11+48/49`
`=14/4-66/33+48/49`
`=7/2-2+48/49`
`=3/2+48/49`
`=243/98`