Odredi nepoznati broj x iz razmjera
85:(0.4−2−21x)=1.25:(3.8−241⋅x+21).Rješenje
Prvi način:
85⋅(3.8−241⋅x+21)=1.25⋅(0.4−2−21x)
85⋅(519−49⋅x+21)=45⋅(52−2−21x)
819−3245x+165=21−25−85x/⋅32
76−45x+10=16−80−20x
−45x+20x=16−80−76−10
−25x=−150/:(−25)
x=6
Drugi način:
85:(0.4−2−21x)=1.25:(3.8−241⋅x+21)
0.625:(0.4−2−0.5x)=1.25:(3.8−2.25⋅x+0.5)
0.625⋅(3.8−2.25⋅x+0.5)=1.25⋅(0.4−2−0.5x)
2.375−1.40625x+0.3125=0.5−2.5−0.625x
2.6875−1.40625x=−2−0.625x
−1.40625x+0.625x=−2−2.6875
−0.78125x=−4.6875
x=6