Question

Ana si Andrei au 115 timbre, Andrei si Marius au 120 timbre si Ana si marius au 105 timbre. Cate timbre are fiecare copil?

va rog, raspundeti repede!!​

Answer 1

Răspuns:

Explicație pas cu pas:

a= Ana

b= Andrei

c=Marius

a+b=115

b+c=120

a+c=105

2a+2b+2c=340 /:2

a+b+c=170

a+120=170

a=50

50+b=115

b=65

50+c=105

c=55

Answer 2

Răspuns:

A+D=115

D+M=120

A+M=105

A+D+D+M+A+M=115+120+105

2A+2D+2M=340

A+D+M=170

A+120=170

A=170-120=50 timbre are Ana

50+D=115

D=115-50=65 timbre are Andrei

50+M=105

M=105-50=55 timbre are Marius