(1+1⼀2+1⼀3+1⼀4)×(1⼀2+1⼀3+1⼀4)-(1+1⼀2+1⼀3+1⼀4+1⼀5)×(1⼀2+1⼀3+1⼀4) 简便方法计算

2024-12-24 12:07:08
推荐回答(4个)
回答1:

回答2:

原式=(1/2+1/3+1/4)X(1+1/2+1/3+1/4-(1+1/2+1/3+1/4+1/5))==(1/2+1/3+1/4)X-1/5=-13/60

回答3:

60 分之13

回答4:

154