\(\dfrac{-7}{8}+\dfrac{8}{13}+\dfrac{-3}{5}+\dfrac{5}{13}\)
nêu cách làm nhé
mình đang bất đồng với mẹ chuyện này
nhanh nhé
mình tick
Tính: \(\dfrac{-5}{7}.\dfrac{2}{13}+\dfrac{-5}{7}.\dfrac{3}{13}-\dfrac{5}{7}.\dfrac{8}{13}\)
CÁC BẠN GIẢI CHI TIẾT BÀI NÀY GIÚP MÌNH NHÉ! CẢM ƠN CÁC BẠN RẤT NHIỀU! 🤧🙏💖
\(-\dfrac{5}{7}\times\dfrac{2}{13}+\dfrac{-5}{7}\times\dfrac{3}{13}-\dfrac{5}{7}\times\dfrac{8}{13}\)
\(=-\dfrac{5}{7}\left(\dfrac{2}{13}+\dfrac{3}{13}+\dfrac{8}{13}\right)\)
\(=-\dfrac{5}{7}\times\dfrac{13}{13}\)
\(=-\dfrac{5}{7}\times1=-\dfrac{5}{7}\)
\(-\dfrac{5}{7}.\dfrac{2}{13}+\dfrac{-5}{7}.\dfrac{3}{13}-\dfrac{5}{7}.\dfrac{8}{13}\)
\(=-\dfrac{10}{91}-\dfrac{15}{91}-\dfrac{40}{91}\)
\(=\dfrac{-10-15-40}{91}\)
\(=-\dfrac{65}{91}=-\dfrac{5}{7}\)
\(\dfrac{-5}{7}.\dfrac{2}{13}+\left(\dfrac{-5}{7}\right).\dfrac{3}{13}-\dfrac{5}{7}.\dfrac{8}{13}\)
\(=\dfrac{5}{7}.\left(\dfrac{-2}{13}+\dfrac{-3}{13}-\dfrac{8}{13}\right)\)
\(=\dfrac{5}{7}.\left(-1\right)\)
\(=-\dfrac{5}{7}\)
\(#PaooNqoccc\)
Tính nhanh: \(\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{7}.\dfrac{9}{13}+\dfrac{3}{13}.\dfrac{6}{7}\)
CÁC BẠN GIẢI CHI TIẾT BÀI NÀY GIÚP MÌNH NHÉ! CẢM ƠN CÁC BẠN RẤT NHIỀU! 🤧🙏💖
`6/7 . 8/13 +6/7 . 9/13+3/13 . 6/7`
`=6/7 . (8/13+9/13+3/13)`
`=6/7 . 20/13`
`=120/91`
\(\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{7}.\dfrac{9}{13}+\dfrac{3}{13}.\dfrac{6}{7}\)
\(=\dfrac{6}{7}.\left(\dfrac{8}{13}+\dfrac{9}{13}+\dfrac{3}{13}\right)\)
\(=\dfrac{6}{7}.\left(\dfrac{8+9+3}{13}\right)\)
\(=\dfrac{6}{7}.\dfrac{20}{13}\)
\(=\dfrac{6.20}{7.13}\)
\(=\dfrac{120}{91}\)
`6/7 . 8/13 + 6/7 . 9/13 + 3/13 . 6/7`
`= 6/7 . ( 8/13 + 9/13 + 3/13)`
`=6/7 . 20/13`
`= 120/91`
\(\dfrac{-5}{13}\)✖\(\dfrac{3}{7}\)-\(\dfrac{2}{17}\)✖\(\dfrac{8}{13}\)+\(\dfrac{5}{13}\)✖\(\dfrac{1}{7}\)
Giải hộ mình nhé có cả lời giải đấy
ok.mình cho 1 tim
Ta có: \(\dfrac{-5}{13}\cdot\dfrac{3}{7}-\dfrac{2}{17}\cdot\dfrac{8}{13}+\dfrac{5}{13}\cdot\dfrac{1}{7}\)
\(=\dfrac{5}{13}\left(-\dfrac{3}{7}+\dfrac{1}{7}\right)-\dfrac{2}{17}\cdot\dfrac{8}{13}\)
\(=\dfrac{5}{13}\cdot\dfrac{-2}{7}-\dfrac{2}{17}\cdot\dfrac{8}{13}\)
\(=\dfrac{-10}{91}-\dfrac{16}{221}\)
\(=\dfrac{-282}{1547}\)
\(\dfrac{-5}{13}.\dfrac{3}{7}-\dfrac{2}{17}.\dfrac{8}{13}+\dfrac{5}{13}.\dfrac{1}{7}\)
\(=\dfrac{5}{13}.\dfrac{-3}{7}-\dfrac{2}{17}.\dfrac{8}{13}+\dfrac{5}{13}.\dfrac{1}{7}\)
\(=\dfrac{5}{13}.\left(\dfrac{-3}{7}+\dfrac{1}{7}\right)+\dfrac{-2}{17}.\dfrac{8}{13}\)
\(=\dfrac{5}{13}.\dfrac{-2}{7}+\dfrac{-2}{13}.\dfrac{8}{17}\)
\(=\dfrac{-2}{13}.\dfrac{5}{7}+\dfrac{-2}{13}.\dfrac{8}{17}\)
\(=\dfrac{-2}{13}.\left(\dfrac{5}{7}+\dfrac{8}{17}\right)\)
\(=\dfrac{-2}{13}.\dfrac{141}{119}\)
\(=\dfrac{-282}{1547}\)
Tính nhanh: \(\dfrac{-3}{7}.\dfrac{15}{13}-\dfrac{3}{7}.\dfrac{11}{13}-\dfrac{3}{7}\)
CÁC BẠN GIẢI CHI TIẾT BÀI NÀY GIÚP MÌNH NHÉ! CẢM ƠN CÁC BẠN RẤT NHIỀU! 🤧🙏💖
\(-\dfrac{3}{7}\times\dfrac{15}{13}-\dfrac{3}{7}\times\dfrac{11}{13}-\dfrac{3}{7}\)
\(=-\dfrac{3}{7}\left(\dfrac{15}{13}+\dfrac{11}{13}+1\right)\)
\(=-\dfrac{3}{7}\left(\dfrac{15}{13}+\dfrac{11}{13}+\dfrac{13}{13}\right)\)
\(=-\dfrac{3}{7}\times\dfrac{39}{13}=-\dfrac{3}{7}\times3=-\dfrac{9}{7}\)
Tính nhanh: \(\dfrac{2}{5}-\dfrac{3}{8}+\dfrac{7}{6}:\dfrac{7}{5}\)
SOS! Giúp mình với, mình sắp phải đi ngủ!! Mệt ghê á tròi! Cảm ơn các bạn trước nhé!
`2/5 - 3/8 + 7/6 : 7/5`
`= 2/5 - 3/8 + 7/6 xx 5/7`
`= 2/5 - 3/8 +5/6`
`= 1/40+5/6`
`=103/120`
So sánh các số hữu tỉ sau: (ko quy đồng)
Câu 1:
\(\dfrac{-25}{37}\)và \(\dfrac{-20}{31}\)
Câu 2:
\(\dfrac{2}{3}\)và\(\dfrac{5}{7}\)
Câu 3:
\(\dfrac{8}{13}\)và\(\dfrac{5}{7}\)
Các bạn trình bày các bước giúp mình nha. MÌNH SẼ TICK CHO BẠN NÀO CÓ ĐÁP ÁN ĐÚNG NHẤT.
Lưu ý: Ko dùng phương án quy đồng
Câu 1 :
\(\dfrac{-25}{37}\&\dfrac{-20}{31}\)
Ta thấy \(\dfrac{-25}{37}< \dfrac{-20}{37}\)
mà \(\dfrac{-20}{37}< \dfrac{-20}{31}\)
\(\Rightarrow\dfrac{-25}{37}< \dfrac{-20}{31}\)
Câu 2 :
\(\dfrac{2}{3}\&\dfrac{5}{7}\)
\(\dfrac{2}{3}:\dfrac{5}{7}=\dfrac{2}{3}.\dfrac{7}{5}=\dfrac{14}{15}< 1\)
\(\Rightarrow\dfrac{5}{7}>\dfrac{2}{3}\) Câu 3 : \(\dfrac{8}{13}\&\dfrac{5}{7}\)Ta thấy \(\dfrac{8}{13}:\dfrac{5}{7}=\dfrac{8}{13}.\dfrac{7}{5}=\dfrac{56}{65}< 1\)
\(\Rightarrow\dfrac{8}{13}< \dfrac{5}{7}\)6. Điền dấu >; <; = vào chỗ chấm:
\(\dfrac{5}{15}\) ...............\(\dfrac{12}{8}\)
\(\dfrac{5}{15}\) ............... \(\dfrac{3}{9}\)
\(\dfrac{5}{15}\) ................ \(\dfrac{5}{8}\)
Giúp mình nhanh với ạ, làm đúng mình tick cho ạ
Tính:
a) \(\dfrac{7}{19}+\dfrac{12}{19}\)
b) \(\dfrac{5}{13}+\dfrac{4}{13}\)
c) \(\dfrac{24}{11}-\dfrac{13}{11}\)
d) \(\dfrac{35}{8}-\dfrac{19}{8}\)
GIÚP MK VỚI HOM NAY MÌNH NÔP RÙI
\(a.\dfrac{7}{19}+\dfrac{12}{19}=\dfrac{7+12}{19}=\dfrac{19}{19}=1\)
\(b.\dfrac{5}{13}+\dfrac{4}{13}=\dfrac{5+4}{13}=\dfrac{9}{13}\)
\(c.\dfrac{24}{11}-\dfrac{13}{11}=\dfrac{24-13}{11}=\dfrac{11}{11}=1\)
\(d.\dfrac{35}{8}-\dfrac{19}{8}=\dfrac{35-19}{8}=\dfrac{16}{8}=2\)
a,\(\dfrac{7}{19}\)+\(\dfrac{12}{19}\)=\(\dfrac{19}{19}\)=1
b,\(\dfrac{5}{13}\)+\(\dfrac{4}{13}\)=\(\dfrac{9}{13}\)
c,\(\dfrac{24}{11}\)-\(\dfrac{13}{11}\)=\(\dfrac{11}{11}\)=1
d,\(\dfrac{35}{8}\)-\(\dfrac{19}{8}\)=\(\dfrac{16}{8}\)=2
\(\dfrac{2}{5}-(\dfrac{5}{7}-x)=\dfrac{3}{5}\)
Cho mình cách làm luôn nhé!
\(\Rightarrow\dfrac{5}{7}-x=-\dfrac{1}{5}\Rightarrow x=\dfrac{32}{35}\)