Question

X x 7 + X x 9 - X - X x 5 = 790

ghi rõ cách giải ra nha !

Answer 1

Xx7+Xx9-X-Xx5=790

Xx7+Xx9-Xx1-Xx5=790

Xx(7+9-1-5)=790

Xx10=790

X=790:10

X=79

Answer 2

X x 7 +X x 9 - X - X x5 =790

<=> X x 7 + X x 9 - X x 1 - X x 5 =790

       X x ( 7 + 9 -1 - 5 ) = 790

       X x 10 = 790

      X = 790 : 10

      X = 79

Answer 3

X x 7 + X x 9 - X - X x 5 = 790

\(\Leftrightarrow7x+9x-x-5x=790.\)

\(\Leftrightarrow10x=790\)

Vậy x= 79

Answer 4

\(x.7+x.9-x-x.5=790\)

\(x\left(7+9-1-5\right)=790\)

\(x.10=790\)

\(x=790\div10\)

\(\Rightarrow x=79\)