(-3⼀5)+(-2⼀5)=? (+1⼀5)+(-4⼀5)=? (-3⼀8)-1⼀2=? 1⼀6-(-2⼀3 )=? (+21⼀5)+(-4⼀5)=? 0.5+(-3⼀4)+(5.25)+(1⼀2)

(+21/5)+(-4/5)=? 的意思是正二又五分之一减负五分之四的和是多少。
2025-03-24 19:20:29
推荐回答(1个)
回答1:

(-3/5)+(-2/5)=-1
(+1/5)+(-4/5)=-3/5
(-3/8)-1/2=-7/8
1/6-(-2/3)=5/6
(+21/5)+(-4/5)=17/5
0.5+(-3/4)=1/2+(-3/4)=-1/4
(5.25)+(1/2)=21/4+(1/2)=23/4