Question

A + A + A = 90

A + 2B + 2B = 230

C + 2B + A = 210

B - A + C =?

 

Answer 1

A+A+A=90 => 3A=90 => A=90:3=30

A+2B+2B=230 = 30+4B=230 => 4B=230-30=200 => B=200:4=50

C+2B+A=210 => C+100+30=210 => C=210-100-30=80

=> B-A+C=50-30+80=100

Answer 2

 A=30

B=50

C=80

=>B-A+C=50-30+80=100

Answer 3

a=30 b=50 c=80   b-a+c =100

Answer 4

A + A + A = 90 => A = 90: 3 = 30

A + 2B + 2B = A + 4B = 230 => 230 - A = 4B

                                           => 230 - 30 = 200

                                           => 4B = 200 : 4 = 50

C + 2B + A = 210 => C + 100 + 30 = 210

                           => C = 210 - 30 - 100 = 80

=> B - A + C = 50 - 30 + 80 = 100

Answer 5

100

100

100

kết quả là 100

Answer 6

A+A+A=90 => 3A=90 => A=90:3=30

A+2B+2B=230 = 30+4B=230 => 4B=230-30=200 => B=200:4=50

C+2B+A=210 => C+100+30=210 => C=210-100-30=80

=> B-A+C=50-30+80=100