=( -13/24 + -5/24 ) +7/21
= -18/24 + 7/21
= -3/4 + 7/21
= -5/12
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Đại số lớp 6
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Tính :
\(6.\dfrac{-5}{18};\dfrac{-13}{24}+\dfrac{-5}{21}.\dfrac{7}{25};\dfrac{-5}{13}-\dfrac{3}{26}.\dfrac{-2}{3};\left(\dfrac{2}{3}+\dfrac{-7}{6}\right).\left(\dfrac{3}{8}+\dfrac{-3}{24}\right)\)
\(\dfrac{-5}{21}\)+\(\dfrac{-2}{21}\)+\(\dfrac{8}{24}\)
thực hiện phép tính( hợp lí nếu có thể)
dfrac{-5}{9}+1dfrac{5}{9}.left(dfrac{3}{4}-dfrac{2}{5}right):7^2
1dfrac{13}{15}.0,75-left(dfrac{104}{195}+25%right).dfrac{24}{47}-3dfrac{12}{13}:3
1dfrac{13}{15}.left(0,5right)^2.3+left(dfrac{8}{15}-1dfrac{19}{60}right):1dfrac{23}{24}
tìm x
60%x+0,4x+x:32
-2x-dfrac{-3}{5}:left(0,5right)^2-1dfrac{1}{4}
left(dfrac{2}{3}-xright):dfrac{3}{4}dfrac{1}{5}
Đọc tiếp
thực hiện phép tính( hợp lí nếu có thể)
\(\dfrac{-5}{9}+1\dfrac{5}{9}.\left(\dfrac{3}{4}-\dfrac{2}{5}\right):7^2\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{104}{195}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\)
\(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
tìm x
\(60\%x+0,4x+x:3=2\)
\(-2x-\dfrac{-3}{5}:\left(0,5\right)^2=-1\dfrac{1}{4}\)
\(\left(\dfrac{2}{3}-x\right):\dfrac{3}{4}=\dfrac{1}{5}\)
1.Tính
a) (dfrac{-2}{3}+1dfrac{1}{4}-dfrac{1}{6}).dfrac{-24}{10}
b) dfrac{13}{15}.0,25.3+(dfrac{8}{15}-1dfrac{19}{60}):1dfrac{23}{24}
c) (dfrac{12}{32}+dfrac{5}{-20}-dfrac{10}{24}):dfrac{2}{3}
d) 4dfrac{1}{2}:(2,5-3dfrac{3}{4})+(dfrac{-1}{2})^2
e) dfrac{-5}{2}:(dfrac{3}{4}-dfrac{1}{2})
2. Tính nhanh
a) dfrac{5}{23}.dfrac{17}{26}+dfrac{5}{23}.dfrac{10}{26}-dfrac{5}{23}
b) dfrac{1}{7}.dfrac{5}{9}+dfrac{5}{9}.dfrac{2}{7}+dfrac{5}{9}.dfrac{1}{7}+dfrac{5}{9}.dfrac{3}{7}
Đọc tiếp
1.Tính
a) (\(\dfrac{-2}{3}\)+1\(\dfrac{1}{4}\)-\(\dfrac{1}{6}\)).\(\dfrac{-24}{10}\)
b) \(\dfrac{13}{15}\).0,25.3+(\(\dfrac{8}{15}\)-\(1\dfrac{19}{60}\)):\(1\dfrac{23}{24}\)
c) (\(\dfrac{12}{32}\)+\(\dfrac{5}{-20}\)-\(\dfrac{10}{24}\)):\(\dfrac{2}{3}\)
d) \(4\dfrac{1}{2}\):(2,5-\(3\dfrac{3}{4}\))+(\(\dfrac{-1}{2}\))\(^2\)
e) \(\dfrac{-5}{2}\):(\(\dfrac{3}{4}\)-\(\dfrac{1}{2}\))
2. Tính nhanh
a) \(\dfrac{5}{23}\).\(\dfrac{17}{26}\)+\(\dfrac{5}{23}\).\(\dfrac{10}{26}\)-\(\dfrac{5}{23}\)
b) \(\dfrac{1}{7}\).\(\dfrac{5}{9}\)+\(\dfrac{5}{9}\).\(\dfrac{2}{7}\)+\(\dfrac{5}{9}\).\(\dfrac{1}{7}\)+\(\dfrac{5}{9}\).\(\dfrac{3}{7}\)
BT2: Tính nhanh
1) \(\dfrac{5}{6}-\dfrac{6}{7}+\dfrac{7}{8}-\dfrac{8}{9}+\dfrac{10}{9}-\dfrac{5}{6}+\dfrac{6}{7}-\dfrac{7}{8}+\dfrac{8}{9}\)
2) \(\dfrac{1}{13}+\dfrac{16}{7}+\dfrac{3}{105}-\dfrac{9}{7}-\dfrac{-12}{13}\)
BT1: Tính nhanh:
6) 81. \(\dfrac{12-\dfrac{12}{7}-\dfrac{12}{289}-\dfrac{12}{85}}{4-\dfrac{4}{7}-\dfrac{4}{289}-\dfrac{4}{85}}\) : \(\dfrac{5+\dfrac{5}{13}+\dfrac{5}{169}+\dfrac{5}{91}}{6+\dfrac{6}{13}+\dfrac{6}{169}+\dfrac{6}{91}}\). \(\dfrac{158158158}{711711711}\)
Tính
\(1\dfrac{13}{15}.0,75-\left(\dfrac{104}{195}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\)
BT2: Tính nhanh
7) \(-1\dfrac{5}{7}.15+\dfrac{2}{7}.\left(-15\right)+\left(-105\right).\left(\dfrac{2}{3}-\dfrac{4}{5}+\dfrac{1}{7}\right)\)
8) \(\dfrac{13}{29}\left(\dfrac{29}{5}-\dfrac{45}{8}\right)-\dfrac{45}{8}\left(\dfrac{9}{8}-\dfrac{13}{29}\right)\)
Các bạn giúp mk nhé! Thank!
a) 1 - (\(5\dfrac{3}{8}+x-7\dfrac{5}{24}\)):( \(-16\dfrac{2}{3}\))=0