Question

tìm X

Xx4,9+X:10=10,5

Answer 1

X x 49/10 + X x 1/10 = 21/2

X x(49/10 + 1/10) = 21/2

X x 5 = 21/2

X=21/2 : 5 

X=21/10

Answer 2

X x 49/10 + X x 1/10 = 21/2

X x(49/10 + 1/10) = 21/2

X x 5 = 21/2

X=21/2 : 5 

X=21/10