□+○=43 □+△=48 ○+△=55 □= ○= △=

问题描述:

□+○=43 □+△=48 ○+△=55 □= ○= △=

设□=x ○=y △=z
x+y=43
x+z=48
y+z=55
解方程组得
x=18
y=25
z=30
□= 18
○= 25
△= 30