tổng ban đầu; 60*2=120
nếu bớt ở số lớn 15 đv thì tổng giảm 15 đv
tổng mới ; 120-15=105
số bé ; 105:(2+1)*1=35
cach lam: 60 nhan2 = 120 tong so phan: 1+2=3 lay 105:3 nhan1=35 lay 35 nhan 2 +15=85[so lon]
Trung binh cong cua hai so la 96. Neu bot so lon 12 don vi thi ta duoc so moi gap 3 lan so be. Tim so be
trung binh cong cua hai so la 60 . Neu bơt so lon di 15 don vi thi ta duoc so moi gap 2 lan so be.Tim so be?
Bai 1 : Tong cua hai so la 2000. Neu so hang thu nhat them 135 don vi va so hang thu hai bot 531 don vi thi duoc tong moi la bao nhieu?
Bai 2 : Tim tong hai so biet rang neu so hang thu nhat bot di 246 don vi va so hang thu hai them 642 don vi thi duoc tong moi bang 2010.
Bai 3 : Hieu cua hai so la 1000. Neu so lon them 235 don vi va so be bot 200 don vi thi duoc hieu moi la bao nhieu?
Bai 4 : Hieu cua hai so bang 1234. Neu so lon bot 234 don vi va so be them 456 don vi thi duoc hieu moi la bao nhieu?
Bai 5 ; Tim hieu cua hai so, biet rang so lon va so be cung bot di 100 don vi thi duoc hieu moi la 1000.
cho 2 so 10,91 va 7,04. tim so a, biet khi bot so 7,04 di a don vi va cong them a don vi vao so 10,91 thi ta duoc 2 so moi ma so lon gap 4 lan so be
hieu 2 so la 111 .tim so be biet neu bot so be di 9 don vi thi ta duoc so moi bang 3/5 so lon
hai so co tong la 187 . neu bot so be di 12 don vi thi so duoc so moi bang 2/3 so lon . tim so lon
hieu cua 2 so bang 111.tim so be,neu bot so be di 9 don vi thi ta duoc mot so moi bang 3/5so lon.so be la ?
tong cua hai so bang hai tram sau muoi.biet neu cung bot di moi so sau don vi thi so lon gap ba lan so be.tim so be
tong cu 2 so bang 260 biet neu cung bot moi so di 6 don vi thi so lon se gap 3 lan so be tim so be
