720:[118-(2.x + 10)]=60
118 - (2.x+10) = 720 : 60
118 - (2.x + 10 ) = 12
2.x +10 = 118 - 12
2.x + 10 = 106
2.x = 106 - 10
2.x = 96
x = 96 : 2
x = 48
Vậy x = 48
Tìm xEN
a. 720 : [118- (2x + 10)]=60
b. 2840+ [(999 - 9x ) : 60 ] x 24 = 3200
c. ( 3x - 48 ) x 6 = 33 . 22 - 23 . 32
1) tìm x , biết :
a) 720 : [ 118 - ( 2 x - 10 ] = 60 ;
b) 2840 + [( 999 - 9 x ) : 60 ] . 24 = 3200 ;
c) ( 3 x - 48 ) . 6 = 3 mũ 3 . 2 mũ 2 - 2 mũ 3 . 3 mũ 2
Thực hiện phép tính (nhanh nếu có thể) {720^120:7^118.[3^160:(3^86.3^74)+3^0]}.20
a) 83 - (-756 - 17) + (50 - 756)
b) -105 + (-34 - 95) - 166
c) -(39 + 228 - 407) + (118 - 161)
d) 5^10 : 5^8 + 60 : 12 + (-10)
e) -342 - (161 - 342) - 39
g) 7^5 : 7^3 + (-187 - 149) - 213
a) 83 - (-756 - 17) + (50 - 756)
b) -105 + (-34 - 95) - 166
c) -(39 + 228 - 407) + (118 - 161)
d) 5^10 : 5^8 + 60 : 12 + (-10)
e) -342 - (161 - 342) - 39
g) 7^5 : 7^3 + (-187 - 149) - 213
( 10+2xX): cho 4 mu 2011= 4 mu 2013
Tìm x :
a) 2x - 138 = 2^3 . 3^2
b) 20 - [ 7 . ( x - 3 ) + 4 ] = 2
c) 310 - ( 118 - x ) = 217
d) 2010^5 . ( x - 60 ) = 2010^6
e) 5 . ( x + 35 ) = 515
f) [ ( 6x - 39 ) : 3 ] . 28 = 5628
g) 720 : [ 41 - ( 2x - 5 ) ] = 2^3 . 5
h) ( 6x - 3^4 ) . 7^3 = 3 . 7^4
v) 4x^3 + 12 = 120
m) 3 . 2^x - 3 = 45
--- Giải nhanh, đúng sẽ hậu tạ. '-' ( Trong khả năng ) ---
g) 101 + (–60) + 29 + (–40)
h) 167 + (–252) + 52 + (–67) i) 38 – 138 + 250 – 350
k) 118 + 107 – (118 – 93) – 50 m) 40 + (139 – 172 + 99) – (139 + 199 – 172)
(17x-26).52016=52018
7x-2x=62+44:11
7x-4.710=3.710
2x+3+2x=144
720:[41-(2x-5)]=40
120+[(999-9x):60].24=480
