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= -5 / 7 x ( 2 / 11 + 9 / 11) + 12/7
= -5/7 x 1 + 12/7
= -5/7 + 12/7
= 1
b, = ( 9/4 x 105 - 9/4 x 101) : 3/2 - 64 x ( 1/4 - 3/4)
= [ 9/4 x ( 105 - 101)] : 3/2 -64 x -1/2
= 9/4 x 4 : 3 /2 - (-32)
= 9 : 3/2 + 32
= 18/3 +32
=
\(1,24:0,5+3,76.2\)
\(=2,48+7,52\)
\(=10\)
\(5,28:0,25+4,72.4\)
\(=21,12+18,88\)
\(=40\)
a) \(-\dfrac{2}{9}-\dfrac{5}{12}\)
\(=-\dfrac{8}{36}-\dfrac{15}{36}\)
\(=-\dfrac{23}{36}\)
b) \(2,25-\left(-\dfrac{6}{25}\right)\)
\(=2,25+\dfrac{6}{25}\)
\(=2,49\)
c) \(\dfrac{5}{12}-\left(-\dfrac{7}{6}\right)\)
\(=\dfrac{5}{12}+\dfrac{14}{12}\)
\(=\dfrac{19}{12}\)
a) \(\dfrac{-2}{9}-\dfrac{5}{12}=\dfrac{-8}{36}-\dfrac{15}{36}=\dfrac{-23}{36}\)
b) \(2,25-\left(-\dfrac{6}{25}\right)=2,25+\dfrac{6}{25}=\dfrac{225}{100}+\dfrac{6}{25}=\dfrac{225}{100}+\dfrac{24}{100}=\dfrac{249}{100}\)
c) \(\dfrac{5}{12}-\left(-\dfrac{7}{6}\right)=\dfrac{5}{12}+\dfrac{7}{6}=\dfrac{5}{12}+\dfrac{14}{12}=\dfrac{19}{12}\)
Chúc bạn học tốt
A. 2/3 + 3/5 = 19/15
B. 4 và 1/4 - 0,25 = 4
C. 12 . 2 và 1/3 = 28
D. 8 và 2/7 + 4 và 3/5 + 1 và 5/7 + 5 và 2/5
= 58/7 + 23/5 + 12/7 + 27/5
= ( 27/5 + 12/5 ) + ( 58/7 + 12/7 )
= 39/5 + 10
= 89/5
= 39/5 + 70/7
Câu 1: A
Câu 2: C
Câu 3: 1/4 quả dưa nặng 0,5kg
Câu 4: =-3-1,3+5,6=4,3-3=1,3
a) \(\dfrac{3}{8}+\dfrac{15}{-25}+\dfrac{3}{5}\)
\(=\dfrac{-9}{40}+\dfrac{3}{5}\)
\(=\dfrac{3}{8}\)
b) \(\dfrac{-5}{18}+\dfrac{23}{45}-\dfrac{9}{10}\)
\(=\dfrac{7}{30}-\dfrac{9}{10}\)
\(=\dfrac{-2}{3}\)
c) \(\dfrac{-5}{12}+\dfrac{15}{18}-2,25\)
\(=\dfrac{5}{12}-2,25\)
\(=\dfrac{-11}{6}\)
d) \(\dfrac{5}{6}+\dfrac{2}{3}-0,5\)
\(=\dfrac{3}{2}-0,5\)
\(=1\)
Tính hợp lí:
a) \(\left(-0,4\right)+\dfrac{3}{8}+\left(-0,6\right)\)
\(=\left[\left(-0,4\right)+\left(-0,6\right)\right]+\dfrac{3}{8}\)
\(=-1+\dfrac{3}{8}\)
\(=\dfrac{\left(-8\right)+3}{8}\)
\(=\dfrac{-5}{8}\)
b) \(\dfrac{4}{5}-1,8+0,375+\dfrac{5}{8}\)
\(=\dfrac{4}{5}-\dfrac{9}{5}+\dfrac{3}{8}+\dfrac{5}{8}\)
\(=-1+1\)
\(=0\\\)
c) \(\dfrac{7}{3}.\left(-2,5\right).\dfrac{6}{7}\)
\(=\dfrac{7}{3}.\dfrac{-5}{2}.\dfrac{6}{7}\)
\(=\dfrac{7}{3}.\dfrac{6}{7}.\dfrac{-5}{2}\)
\(=2.\dfrac{-5}{2}\)
\(=-5\)
d) \(\dfrac{7}{12}.\left(-2,34\right)-\dfrac{7}{12}.\left(-0,34\right)\)
\(=\dfrac{7}{12}.\left[\left(-2,34\right)+0,34\right]\)
\(=\dfrac{7}{12}.\left(-2\right)\)
\(=\dfrac{-7}{6}\)
e) \(\dfrac{-8}{3}.\dfrac{2}{11}-\dfrac{8}{3}:\dfrac{11}{9}\)
\(=\dfrac{8}{3}.\dfrac{-2}{11}-\dfrac{8}{3}.\dfrac{9}{11}\)
\(=\dfrac{8}{3}.\left(\dfrac{-2}{11}-\dfrac{9}{11}\right)\)
\(=\dfrac{8}{3}.-1\)
\(=\dfrac{-8}{3}\)
Chúc bạn học tốt
a: \(12-\left(-0,6\right)=12+0,6=12,6\)
b: \(\left(-0,25\right)\cdot1,24=-\dfrac{1}{4}\cdot\dfrac{31}{25}=\dfrac{-31}{100}\)
c: \(\left(-4,5\right)+\left(17,45\right)=17,45-4,5=12,95\)
d: \(\dfrac{-5,85}{2,25}=\dfrac{-585}{225}=-\dfrac{13}{5}=-2,6\)