Question

1. a+b+c=651 a+b=347 b= c-141 A=?b B=? C=?
2.a+b-c=315 a+b=349 b=c+32 A=? B=? C=?

Answer 1

1. a + b + c = 651
a + b = 347
b = c - 141
Inlocuind, avem:
347 + c = 651
c = 651 - 347 ⇔ c = 304
b = c - 141 ⇔ b = 304 - 141 ⇔ b = 163
a + b = 347 ⇔ a + 163 = 347 ⇔ a = 347 - 163 ⇔ a = 184

2. a + b - c = 315
a + b = 349
b = c + 32
Inlocuind, avem:
349 - c = 315
-c = 315 - 349 ⇔ -c = -34 ⇔ c = 34
b = c + 32 ⇔ b = 34 + 32 ⇔ b = 66
a + b = 349 ⇔ a + 66 = 349 ⇔ a = 349 - 66 ⇔ a = 283