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a fost răspuns

daca adaug 40 unui nr el devine jumatetea din alt nr . Stiind ca suma lor este 350 , afla nr

Răspuns :

HannahMontanna
a+40=b÷2 /×2
2a+80=b
b=2a+80
a+b=350
a+2a+80=350
3a=350-80
3a=270
a=270÷3
a=90
b=90×2+80
b=180+80
b=260
Sper ca te-am ajutat!
EnglishzzBoi
[tex]\begin{bmatrix}40+a=\frac{b}{2}\\ a+b=350\end{bmatrix} \\ 40+a=\frac{b}{2} \\ 40+a-40=\frac{b}{2}-40 \\ a=\frac{b}{2}-40 \\ \begin{bmatrix}\frac{b}{2}-40+b=350\end{bmatrix} \\ a=\frac{b}{2}-40 \\ b=260 \\ a=\frac{260}{2}-40 \\ a=90 \\ b=260,\:a=90 \\ [/tex]