a. => 225-x=135
=> x=225-135
Vậy x=90.
b. => 7.(x-14)+35=25+31
=> 7.(x-14)=25+31-35
=> 7.(x-14)=21
=> x-14=3
=> x=3+14
Vậy x=17
c. => 7x:72=727
=> 7x-2=727
=> x-2=27
=> x=27+2
Vậy x=29.
Tìm x
7 ( x - 14 ) + 35 = 25 + 279 : 3
Tìm x
7 . ( x - 14 ) + 35 = 25 + 279 : 9
Tìm x
7( x -14 ) + 35 = 25 + 279 : 3
a) 580:(x-24)=329-150.21
b)7.(7-14)+35=25+279:9
22) tim x thuoc n biết
a)2^x=16
b)4^x=64
c)15^x=225
d)2^x-15=17
e)2^x-64=2^6
f)(7x-11)^3=2^5.5^2+200
1,Tính nhanh
a, 568 + 568 x 135 - 568 x 36
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
cac ban oi giup minh voi
1.tim a,b thuoc Z,biet:a.(2b-3)=-6
2.cho x,y thuoc Z thoa man x mu 2 +y mu 2 chia het cho 3.chung to x va y chia het cho 3.
cho A = 1/15 nhan 225/(8+2) + 3/14 nhan 196/(3x+6) (x thuoc Z; x khac -2 )
a) Rut gon A
b) Tim x thuoc Z de A thuoc Z
c) trong cac gia tri nguyen A tim gia tri lon nhat va gia tri nho nhat
Bai1:Tim x thuoc Z biet:
a)7x=14
b)6x-(-5)=17
(x+2) (x-9)=0
