3. Tìm x

\(a)\,x \times 34 = 714\)                     \(b)\,846:x = 18\)

Lời Giải:

3.

a)

\(\eqalign{
& x \times 34 = 714 \cr
& x\,\,\,\,\,\,\,\,\,\,\,\,\, = 714:34 \cr
& x\,\,\,\,\,\,\,\,\,\,\,\,\, = 21 \cr} \)

b) 

\(\eqalign{
& 846:x = 18 \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,x\, = 846:18 \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,x = 47 \cr} \)