Question

Am nevoie de 3 si 5 de sus

Answer 1

3)x/y=2/7=>x=2=>y=7
x/x+y;2x+3y/x
2/7+2=2/9
2*2+3*7/9=4+21=25/9
5)a+b=400
{a;b}i.p{8;9/2}=>a*8=b*9/2=k=>a=k/8
                                                      b=2k/9
=>k/8+2k/9=400
=>9k/72+16k/72=400
=>25k/72=400
=>k=72*400/25=k=72*16=1152
=>a=1152/9=>a=144
=>b=1152*2/9=256
144+256=400
coronita?