Question

​tìm giá trị X sau đây: X x 1/4 + X x 1/5 + X x2 = 19,6

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Answer 1

X x 1/4+X x 1/5+X x 2=19,6

X x (1/4+1/5+2)=19,6

X x 2,45=19,6

X=19,6:2,45

X=8

Answer 2

X x (1/4+1/5+2)=19,6

X x 2,45=19,6

X=19,6:2,45

X=8

Answer 3

X x 1/4 + X x 1/5 + X x2 = 19,6

X x     ( 1/4 + 1/5 + 2 )   = 19,6

X x             2,45            = 19,6

X                                  = 19,6 : 2,45

X                                  =       8