① |-45|+(-71)+|-5|+(-9) ② (-53)+(+21)-(-69)-(+37)

问题描述:

① |-45|+(-71)+|-5|+(-9) ② (-53)+(+21)-(-69)-(+37)
③ -14+ ÷[3-(-2)2 ]

1.
45-71+5-9=-30
2.
-53+21+69-37=0
3.
-14/(3-4)=14你好积极啊