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a) \(\frac{3}{5}:\left(-\frac{1}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(-\frac{1}{3}-1\frac{1}{15}\right)\)
\(=\frac{3}{5}:\left(-\frac{1}{15}-\frac{1}{6}-\frac{2}{6}-1+\frac{1}{15}\right)\)
\(=\frac{3}{5}:\left(-\frac{1}{2}-1\right)\)
\(=\frac{3}{5}:\left(-\frac{3}{2}\right)\)
\(=-\frac{2}{5}\)
b) \(\left(-\frac{3}{4}+\frac{5}{13}\right):\frac{2}{7}-\left(2\frac{1}{4}+\frac{8}{13}\right):\frac{2}{7}\)
\(=\left(-\frac{3}{4}+\frac{5}{13}-2+\frac{1}{4}+\frac{8}{13}\right):\frac{2}{7}\)
\(=\left(-\frac{1}{2}+1-2\right):\frac{2}{7}\)
\(=\left(-\frac{1}{2}-1\right):\frac{2}{7}\)
\(=-\frac{3}{2}:\frac{2}{7}\)
\(=-\frac{21}{4}\)
-4/5 + 11/3 - 9/10 =(-4/5 + 11/3) -9/10 =43/15 -9/10 =59/30 5/6 + -7/15 - 13/30 =(5/6 + -7/15) -13/30 =11/30 - 13/30 =-1/15 CHÚC EM HỌC TỐT ^_^
a) 1-5+7-8+4-1+5-7+8
=(1-1) - (-5+5) -(7-7) -(-8+8) +4
=0
b)=-39+9
=-30
c)=(20-20)-(-4+4)-(8-8)-17+15
=-2
d)= (13-13)-(-98+98)-(91-91)-75
=-75
M = \(\frac32\) - \(\frac56\) + \(\frac{7}{12}\) - \(\frac{9}{20}\) + \(\frac{11}{30}\) - \(\frac{13}{42}\) + \(\frac{15}{56}\) - \(\frac{17}{72}\)
M = \(\frac{3}{1.2}\) - \(\frac{5}{2.3}\) + \(\frac{7}{3.4}\) - \(\frac{9}{4.5}\) + \(\frac{11}{5.6}\) - \(\frac{13}{6.7}\) + \(\frac{15}{7.8}\) - \(\frac{17}{8.9}\)
M = \(\frac11+\frac12\) - \(\frac12-\frac13\) +....+\(\frac17+\frac18\) - \(\frac18\) - \(\frac19\)
M = \(\frac11\) - \(\frac19\)
M = \(\frac89\)
a) 18-10:2-7=18-5-7=6
b) 15:(-5)*(-3)-8=-3*(-3)-8=9-8=1
c) (6*8-10:5)+3*(-7)=(48-2)+(-21)=46-21=25
a)18-10:2-7
= 18-5+7
= 13+7
= 20
b)15:(-5).(-3)-8
= -3.(-3) - 8
= 9-8
= 1
c)(6.8-10:5) + 3.(-7)
= (48-2) + (-21)
= 46+(-21)
= 25
Chúc bạn học tốt
Câu b:
1/5 : 1/10 - 1/3.(6/5 - 9/4)
= 1/5 x 10 - 1/3.(24/20 - 45/20)
= 2 - 1/3.(-21/20)
= 2 + 7/20
= 40/20 + 7/20
= 47/20
a) \(516-\left[\left(54-2^2\cdot7\right):13+3^4\cdot5\right]\)
\(=516-\left[\left(54-28\right):13+81\cdot5\right]\)
\(=516-\left(26:13+405\right)\)
\(=516-407\)
\(=109\)
b) \(15+\left|14+\left(-18\right)\right|+\left(-9\right)\)
\(=15+4-9\)
\(=10\)