tính nhanh -5/17.2/9+7/17.-5/9+2010.5/17
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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 )
2. Tính (+5) + ( +4) = 9
3.Tính (- 9) + ( - 1) = -10
4.Tính : 28 + (-15) = 13
5.Tính (-15) + 12 = - 3
6.Tính (-25) + 25 = 0
7.Tính : 13 - 17 = - 4
8.Tính : (-78) - 9 = - 87
9.Tính : ( -24) - ( - 16) = - 8
10.Tính : 17 - (-3) = 20
11.Tính nhanh : (-21) - ( 48 + 52 - 21) = -100
2, (+5)+(+4)=+9 hoạc 9 cũng được
3, (-9)+(-1)=-10
4, 28+(-15)=13
5, (-15)+12=-3
6, (-25)+25=0
7, 13-17=4
8, (-78)-9=-87
9, (-24)-(-16)=-40
10, 17-(-3)=20
11, (-21+21)-(48-52)=-4
a) 5/17 * 8/-7+8/17*-7/3+-7/3*4/17
-40/119 + 12/17 × -7/3
-40/119 + -28/17 =-236/119
b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20
(5/17+12/17)-(10/13+3/13)-11/20
-11/20
a) 5/17 * 8/-7+8/17*-7/3+-7/3*4/17
-40/119 + 12/17 × -7/3
-40/119 + -28/17 =-236/119
b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20
(5/17+12/17)-(10/13+3/13)-11/20
-11/20
3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19
= (3 + 19) + (5 + 17) + (7 + 15) + (9 + 13) + 11
= 22 + 22 + 22 + 22 + 11
= 22 x 4 + 11
= 88 + 11
= 99
\(\dfrac{-5}{17}\cdot\dfrac{2}{9}+\dfrac{7}{17}\cdot\dfrac{-5}{9}+2010\cdot\dfrac{5}{17}\)
\(=\dfrac{-5\cdot2+7\cdot\left(-5\right)}{153}+2010\cdot\dfrac{5}{17}\)
\(=\dfrac{-45}{153}+2010\cdot\dfrac{5}{17}\)
\(=2009\cdot\dfrac{5}{17}=\dfrac{10045}{17}\)
\(\dfrac{-5}{17}.\dfrac{2}{9}+\dfrac{7}{17}.\dfrac{-5}{9}+2010.\dfrac{5}{17}\)
\(=\dfrac{-5}{17}.\dfrac{2}{9}+\dfrac{-5}{17}.\dfrac{7}{9}+2010.\dfrac{-5}{17}\)
\(=\dfrac{-5}{17}.\left(\dfrac{2}{9}+\dfrac{7}{9}+2010\right)\)
\(=\dfrac{-5}{17}.2011\)
\(=-\dfrac{10055}{7}\)