计算1.(-1/30)/(1/3-1/5-1/10+1/15)2.(3/5-1/2-7/12)×(60×3/7-60×1/7+60×5/7)
问题描述:
计算1.(-1/30)/(1/3-1/5-1/10+1/15)
2.(3/5-1/2-7/12)×(60×3/7-60×1/7+60×5/7)
答
(36/60 -30/60 - 35/60 ) . 60(3/7 - 1/7 +5/7 )
= -29/60 . 60
= -29
答
1.(-1/30)/(1/3-1/5-1/10+1/15)=(-1/30)/(10/30-6/30-3/30+2/30)=-)1/30)/(3/30)=-1/3\2.(3/5-1/2-7/12)×(60×3/7-60×1/7+60×5/7)=(3/5-1/2-7/12)×60×(3/7--1/7+5/7)=(3/5×60-1/2×60-7/12×6...