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a) \(7\times\left(10-3\right)-8\times\left(2-9\right)\)
\(=7\times7-8\times\left(-7\right)\)
\(=49-\left(-56\right)\)
\(=49+56\)
\(=105\)
b) \(-17\times\left(13+5\right)-13\times\left(17-2\right)\)
\(=-17\times18-13\times15\)
\(=-306-195\)
\(=-501\)
HOK TOT
31/17 + (-5/13) + (-8/13) - 14/17
= ( 31/17 - 14/17 ) + (-5/13) + (-8/13)
= 17/17 + ( -13/13)
= 1 + ( -1 )
= 0
HỌC TỐT!
k nhớ
\(\frac{31}{17}\) + \(\frac{-5}{13}\) + \(\frac{-8}{13}\) - \(\frac{14}{17}\)
=(\(\frac{31}{17}\) - \(\frac{14}{17}\) ) +( \(\frac{-5}{13}\) + \(\frac{-8}{13}\))
=1 + -1
=0
Học tốt
A) =(5+(-15))+(9+(-19))+(-11)+(13+17)+(21+(-23))
=(-10)+(-10)+(-11)+20+(-2)
=((-10)+(-10))+(-11)+(-2)+20
=(-20)+(-11)+20+(-2)
=((-20)+20)+((-11)+(-2))
=0+(-13)=-13
B) doi ti !!!!! Tich cho mik nha
\(\dfrac{2}{3}+\dfrac{5}{7}+\left(\dfrac{-2}{3}\right)\)
=\(\left[\dfrac{2}{3}+\left(\dfrac{-2}{3}\right)\right]+\dfrac{5}{7}\)
=\(0+\dfrac{5}{7}=\dfrac{5}{7}\)
\(\dfrac{31}{17}+\left(\dfrac{-5}{13}\right)+\left(\dfrac{-8}{13}\right)-\dfrac{14}{17}\)
=\(\left(\dfrac{31}{17}-\dfrac{14}{17}\right)+\left[\left(\dfrac{-5}{13}\right)+\left(\dfrac{-8}{13}\right)\right]\)
=\(1+\left(-1\right)\)
=\(0\)
\(\dfrac{2}{3}+\dfrac{5}{7}+\left(-\dfrac{2}{3}\right)=\dfrac{5}{7}\)
\(\dfrac{31}{17}+\left(-\dfrac{5}{13}\right)+\left(-\dfrac{8}{13}\right)-\dfrac{14}{17}=1-1=0\)
a: =-3/24-40/24
=-43/24
b: \(=\dfrac{6}{54}\cdot\dfrac{49}{35}=\dfrac{1}{9}\cdot\dfrac{7}{5}=\dfrac{7}{45}\)
c: \(=\dfrac{6}{5}+\dfrac{4}{3}=\dfrac{18+20}{15}=\dfrac{38}{15}\)
d: \(=\dfrac{31}{17}-\dfrac{14}{17}-\dfrac{5}{13}-\dfrac{8}{13}=1-1=0\)
a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
a: =-5/9-4/9+8/15+7/15-2/11=-2/11
b: =10/17+7/17-5/13-8/13+11/25
=11/25
c: =(9/12-2/12)*3/2=7/12*3/2=21/24=7/8
d: =(31/10-25/10)*3-2
=3/5*3-2
=9/5-2
=-1/5
31/17+(-5/13)+(-8/13)-14/17
=(31/17-14/17)+[-5/13+(-8/13)]
=1+(-1)
=0
\(\frac{31}{17}+\frac{-5}{13}+\frac{-8}{13}-\frac{14}{17}\)
\(=\left[\frac{31}{17}-\frac{14}{17}\right]+\left[\frac{-5}{13}+\frac{-8}{13}\right]\)
\(=1+(-1)=0\)