dien dau:
cho ab+24........5b+3a
dien dau <>= voi x khac 0, 29+42-x .... 42+29+x
x-26...x-18
cho m x 3 +m+m =m x.....
so thich hop dien vao dau cham la...
5a +3b......24ab
Dien dau
tim x
24-x=21
x=?
dien dau
99 99 99 = 100
4 × 6 = ....... : 2 + 19
dien vao dau ....
45.............45
123.............213
457................145 dien dau