Question

Stiind ca x=14,calculati a+b in fiecare din cazurile
a)a+b-3x=56
b)7*a+7*b+7*x=700
c)39*a+39*b-39*x=3900
d)x*a+x*b=140
e)11*a+11*b+56+x=1170
f)30*x-a-b=241
g)9*x-2a-2*b=100
h)x*a+x*b+6*a+6*b=200

Answer 1

a) a+b-3x=56 => a+b=56+3x=56+3*14=56+42=98
b)7a+7b+7x=700 <=> a+b+x = 100 => a+b =100-x=100-14=86
c)39a+39b-39x=3900 <=> a+b-x=100 => a+b=x+100=14+100=114
d) => a+b = 140/x=140/14=10
e)11*(a+b)+56+x=1170 => a+b = (1170-14-56)/11 = 1100/11=100
f)30*x- (a+b)=241 => a+b = 30*x -241 = 30*14 -241 =420-241=179
g)9*14 -2*(a+b)=100 => a+b = (9*14-100)/2= 13
h)= x*(a+b)+6*(a+b)=200 <=> (x+6)*(a+b)=200 => a+b = 200/(14+6) = 10