Question

X x 4 +  X x 7 + X x 9 = 40300

Answer 1

X x 4 + X x 7 + X x 9 = 40300

X x ( 4 + 7 + 9) = 40300

X x 20 = 40300

X = 40300 : 20

X = 2015

Vậy X = 2015

Answer 2

\(x\cdot4+x\cdot7+x\cdot9=40300\)

\(x\cdot\left(4+7+9\right)=403000\)

\(x\cdot20=40300\)

\(x=40300:20\)

\(x=2015\)

Answer 3

\(x\cdot4+x\cdot7+x\cdot9=40300\)

\(x\cdot\left(4+7+9\right)=403000\)

\(x\cdot20=40300\)

\(x=40300:20\)

\(x=2015\)

Answer 4

X x 4 + X x 7 + X x 9 = 40300

               X x (4+7+9)=40300

                       X x 20=40300

                              X=40300 : 20

                              X=2015