Question

Tìm 4 số a, b, c và d. Biết rằng:

a + b + c = 154

b + c + d = 137

c + d + a = 187

d + a + b = 167

Answer 1

a=154-137=17

b=187-154=33

c=167-157=13

d=187-154=33

Answer 2

a+b+c+b+c+d+c+d+a+d+a+b

=> 3a+3b+3c+3d=154+137+187+167=645

=> 3(a+b+c+d)=645

=> a+b+c+d=215

=> d=215-(a+b+c)=215-154=61

=> a=215-(a+c+d)= 215-137=78

=> b=215-(c+d+a)=215-187=28

=> c=215-(d+a+b)=215-167=48

Vậy a=78;b=28;c=48;d=61

Answer 3

a+b+c+d=(154+137+187+167):3

a+b+c+d=215

a=215-137=78

b=215-187=28

c=215-167=48

d=215-154=61

Answer 4

hong biet

123

Answer 5

a = 17

b = 33

c = 13

d = 33