1、移项通分,x=59/70-3/5-1/7=59/70-42/70-10/70=7/70=1/10
2、利用规律带入,原式=1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)
=1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6
=1+1/6=7/6
1、移项通分,x=59/70-3/5-1/7=59/70-42/70-10/70=7/70=1/10
2、利用规律带入,原式=1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)
=1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6
=1+1/6=7/6