Question

5 x X +4 x X + x = 400

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Answer 1

5 x X + 4 x X + x = 400

X x ( 5 + 4 + 1 ) = 400

X x 10 = 400

X = 400 : 10

X = 40

Vậy: X = 40

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Answer 2

5 x X +4 x X+x=400

X x (5+4+1) =400

X x  10=400

X=400 : 10

X=40

Answer 3

Xx(5+4+1)=400

Xx10=400

X=400:10

X=40

Answer 4

5 x X + 4 x X + X = 400

X x ( 5 + 4 + 2 ) = 400

X x 10 = 400

X = 400 : 10

X = 40

Answer 5

5xX+4xX+x=400

Xx(5+4+1) = 400

Xx10=400

x=400/10=40

Answer 6

5*x+4*x+x=400

suy ra:x*(5+4+1)=400

nên:x*10=400

nên x=40

vậy x=40

Answer 7

5xX+4xX+X=400

5xX+4xX+Xx1=400

(5+4+1)xX=400

10xX=400

      X=400:10(tìm thừa số)

      X=40