1.a,(x-12,5):3/4=8/5
b,(x-2/5)x5/11=75/22
2.DT mot tam bang HCN la3,575m2,CR cua tam bang la 130cm.Ng ta muon nep xung quanh tam bang do bang khung nhom.Hoi khung nhom do dai bn m?
3.Cuoi nam 2003 so dan mot huyen la 93750ng.Neu muc tang dan so hang nam la 1,6% thi den cuoi nam 2005 so dan huyen do la bn ng?
Giai giup vs a~Iu lem a~Mong cac ben iu lam giup bit bai neo lam bai do ko bat buoc nhoa,nhanh mk tick choa 3 tick lun nhe!I LOVE YOU PAC PAC!:3333
1.
a. (x - 12,5) : 3/4 = 8/5
x - 12,5 = 8/5 x 3/4
x = 6/5 + 12,5
x = 137/10 = 13.7
1.
b, (x -2/5) x 5/11 = 75/22
x - 2/5 = 75/22 : 5/11
x = 15/2 + 2/5
x = 79/10 = 7.9