Question

Determinaţi numărul X, ştiind ca a-b=6, şi:

*a) X+3⋅a-3⋅b=20*

*b) X⋅a-x⋅b+9a-9b=654*

*c) 7⋅a-7⋅b+X=55*

*d) 13+X-(5⋅a-5⋅b)=2011*

Answer 1

Răspuns:

a-b=6

A. x+3×a-3×b=20

x+3 (a-b)=20

x+18=20

x=2

B. x×a-x×b+9a-9b=654

x(a-b)+9(a-b)=654

6x+9×6=654

6x+54=654

6x=600

x=100