34.{[(216+184):8]-42}
465+58+(-465)+(-78)
1+(-3)+5+(-7)+9+(-11)
1+2+3.......+100
80-[30-(5-1)2]
BAI 2 tim x biet
123-5.(x+4)=38
10+2x=2.(32-1)
2.x-138=23.32
[102+(28-2x)]:20-5=1
231-(x-6)=1339:13
42 chia het cho x va 5 <x<25
3|x|=52-1
|x-1=3
3x-121=23.32+2
x chia het cho 45 va x <100
giup mk ti mk tick cho ai nhanh nha :
bài 2 :
a) 123-5.(x+4)=38
5.(x+4)=123-38=85
x+4=85:5=17
x=17-4=13
b) 10 + 2x=2.(32-1)
10+2x =16
2x=16-10=6
x=6:2=3
Tớ thấy cũng toàn câu dễ