`-5/7 . 3/11 +(-5/7) . 8/11`
`= -5/7 . (3/11 + 8/11)`
`=-5/7 . 11/11`
`=-5/7 . 1`
`=-5/7`
`-5/7 . 3/11 +(-5/7) . 8/11`
`= -5/7 . (3/11 + 8/11)`
`=-5/7 . 11/11`
`=-5/7 . 1`
`=-5/7`
Thực hiện các phép tính sau (một cách hợp lí) a) 2/5 - 1/4 + 3/10 b) -2/5:(1 - 1/10) c) 7/8.4/9+1/14:5/14 d, 2/7.3/11+2/7.8/11
-1/9.15/22.-9/25
-2/7.(5/13-9/15)-2/7.8/13
3/10.(-4/9+2/5)-3/10.(5/9+-3/5)
4/11+-5/13+7/11+-8/13
tính nhanh
a] 3/5 . 1195/1999 +4/1999 . 3/5
b] 2/3 : 5/7 . 5/7 : 2/3 + 1934
c] 7/8 :5 +7/8 .5 -2 .7.8
d] 3 1/11 .27/46.16/11. 24.9
I.Tính giá trị của các biểu thức sau bằng cách nhanh nhất :
A = 5/7.8/11 + 5/11.17/7 - 5/21.9/11
B = 1/2 + 1/3 + 1/6 + 1/12 + 1/15 + 1/20 + 1/30 + 1/35 + 1/42 + 1/56 + 1/63
C = 4^6.9^5+6^9.120/8^4.3^12-6^11
a)|-37|+(-|15|)=?
b)1125:1123-35:(110+23)-60=?
c)100:52+7.32=?
Ai nhanh mk tick cho nha^_^
37/7.8/11+58/7.5/11-327/7.2/11
1) 1.2.3...9 - 1.2.3...8 - 1.2.3...7.82
2) \(\frac{\left(3.4.2^{16}\right)^2}{11.2^{13}.4^{11}-16^9}\)
3)13 - 12 + 11 + 10 - 9 + 8 - 7 - 6 + 5 -4 +3 +2 -1
Tính hợp lý:
a. (102+112+122) : (132+142)
b. 1.2.3...9-1.2.3...8-1.2.3...7.82
c. 13-12+11+10-9+8-7-6+5-4+3+2-1
a,(100.5^7+5^11:25):(5.5^13:25^2)
b,(3^12+3^11):3^10
c,(2^43+2^4):(2^20+1)
d,(2^22+2^24+2^25):(2^18+2^19+2^20)
e,7.3^9+3^10+51.3^8