👤

a+ b=1240 4/5a=3/4b cum se rezolva aceasta problema?

Răspuns :

(4/5)·a=(3/4)·b
4a/5=3b/4
4a·4=3b·5
16a=15b
a=15b/16
a+b=1240

a+(15a/16)=1240
(16a+15a)/16=1240
31a=1240·16
a=19840/31
a=640
640+b=1240
b=1240-640
b=600