负7/9乘15= (-0.25)乘(-1.25)乘4乘8= -240 2/3乘1/24= (1/3--3/5+3/10)除7/30=
问题描述:
负7/9乘15= (-0.25)乘(-1.25)乘4乘8= -240 2/3乘1/24= (1/3--3/5+3/10)除7/30=
(-8)除(1/2--3/4+5/8)=
答
负7/9乘15=-35/3
(-0.25)乘(-1.25)乘4乘8
=0.25x4x(1.25x8)
=1x10
=10
-240 2/3乘1/24
=-240x1/24-2/3x1/24
=-10-1/36
=-10又1/36
(1/3--3/5+3/10)除7/30
=1/3x30/7-3/5x30/7+3/10x30/7
=10/7-18/7+9/7
=1/7
(-8)除(1/2--3/4+5/8)
=8÷(6/8-4/8-5/8)
=8÷-3/8
=-64/3--{1又3/7+(-12)除6}平方乘(-3/4)=5--3除2乘1/2--负2的绝对值平方=-0.5+(-1/2)平方--负2平方--4绝对值=