阿Q吧 > (4+1⼀5+1⼀6+1⼀7)*(1⼀5+1⼀6+1⼀7+1⼀8)-(4+1⼀5+1⼀6+1⼀7+1⼀8)*(1⼀5+1⼀6+1⼀7)

(4+1⼀5+1⼀6+1⼀7)(1⼀5+1⼀6+1⼀7+1⼀8)-(4+1⼀5+1⼀6+1⼀7+1⼀8)(1⼀5+1⼀6+1⼀7)

急急！！！尽量让人容易明白

2025-03-17 19:36:59

推荐回答（2个）

回答1：

原式=4*(1/5+1/6+1/7+1/8)+（1/5+1/6+1/7)*(1/5+1/6+1/7+1/8)-[(1/5+1/6+1/7+1/8)*(1/5+1/6+1/7)+4*(1/5+1/6+1/7)]
=4*(1/5+1/6+1/7+1/8）-4*(1/5+1/6+1/7)
=1/2

回答2：

=(4+1/5+1/6+1/7)*【(1/5+1/6+1/7）+1/8】-(4+1/5+1/6+1/7+1/8)*(1/5+1/6+1/7)
=(4+1/5+1/6+1/7)*(1/5+1/6+1/7）+(4+1/5+1/6+1/7)*1/8-(4+1/5+1/6+1/7+1/8)*(1/5+1/6+1/7)
=(1/5+1/6+1/7）*【(4+1/5+1/6+1/7)-(4+1/5+1/6+1/7+1/8)】+（4+1/5+1/6+1/7)*1/8
=（4+1/5+1/6+1/7)*（-1/8）+（4+1/5+1/6+1/7)*1/8
=1/8*【（4+1/5+1/6+1/7)-（4+1/5+1/6+1/7)】
=1/8*（-4）
=-1/2