Tính nhanh:9/5:17/15+8/5:17/15
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a,-5/9 + 8/18 + -2/11 + 4/-9 + 7/15 b,5/17 + -9/15 + -2/17 + 2/5 + 14/17
= -5/9 + 4/9 + -2/+ 4/-9 + 7/15 = 5/17 + -3/5 + -2/17 + 2/5 + 14/17
=(-5/9 + 4/9 + -4/9 ) +-2/11 + 7/15 = ( 5/17 + -2/17 + 14/17) + ( 2/5 + -3/5)
= -1/3 + -2/11 + 7/15 =1 + -1/5
=-75/225 + -30/ 225 + 77/225 =4/5
= -25/225 = -1/9 ( 4/5 = 0.8 )
a) 3/7 + 4/9 + 4/7 + 5/9
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )
= 7/7 + 9/9
= 1 + 1
= 2
b)1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45
= 1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5
= ( 1/5 + 9/5 ) + ( 2/5 + 8/5 ) + (7/5 + 3/5 ) + ( 4/5 + 6/5 ) + 5/5
= 2 + 2 + 2 + 2 + 1
= 2 x 4 + 1
= 8 +1
= 9
c) 1/8 + 1/12 + 3/8 + 5/12
= ( 1/8 + 3/8 ) + ( 1/12 + 5/12)
= 4/8 + 6/12
= 1/2 + 1/2
= 2/4 = 1/2
mỏi tay rồi
d; (1 - \(\dfrac{1}{2}\)) x (1 - \(\dfrac{1}{3}\)) x (1 - \(\dfrac{1}{4}\)) x ... x ( 1 - \(\dfrac{1}{100}\))
= \(\dfrac{1}{2}\) x \(\dfrac{2}{3}\) x \(\dfrac{3}{4}\) x \(\dfrac{3}{4}\) x ... x \(\dfrac{99}{100}\)
= \(\dfrac{1}{100}\)
9/5 : 17/15 + 8/5 : 17/15
Bạn nào trả lời nhanh nhất sẽ được 4 cái tíck nha
Nhanh tay lên nào các bạn
1) \(\frac{1}{5}+\frac{3}{17}-\frac{4}{3}+\left(\frac{4}{5}-\frac{3}{17}+\frac{1}{15}\right)\)
\(=\frac{1}{5}+\frac{3}{17}-\frac{4}{3}+\frac{4}{5}-\frac{3}{17}+\frac{1}{15}\)
\(=\left(\frac{1}{5}+\frac{4}{5}\right)+\left(\frac{3}{17}-\frac{3}{17}\right)-\left(\frac{4}{3}-\frac{1}{15}\right)\)
\(=1+0-\frac{19}{15}\)
\(=-\frac{14}{15}\)
9/5 : 17/15 + 8/5 : 17/15= 17/15 : ( 9/5 + 8,5 )
= 17/15 : 17/5
= 1/3
a) 27 + ( -2019 ) + ( -27 )
= [ 27 + ( - 27) ] + ( - 2019)
= 0 - 2019
= - 2019
b) ( -10 ) + 23 + ( -20 ) + 30
= [ ( - 10 ) + (- 20) + 30]+ 23
= [ ( - 30) + 30] + 23
= 0 + 23 = 23
c) ( -2 ).125.( -5 ).( -8 ).( +17 )
= [ - 2 . ( - 5 )] . [ 125 . ( - 8)] . 17
= 10 . 1000 . 17
= 170000
d) ( -9 ) + ( -15 ) + ( -33 )
= - 24 + ( - 33 )
= - 57
e) ( -15 ).6 = - 80
f) 5.( -9 ) + 4.9 = 9 . ( - 5 + 4) = 9 . 1 = 9
9/5:17/15+8/5:17/15
=(9/5+8/5):17/15
=17/5:17/15
=3
Chúc bạn học giỏi nha!!!
K cho mik vs nhé Tuyên
9/5:17/15+8/5+17/15
=(9/5+8/5):17/15
=17/5:17/15
=3