写过程,谢谢,我会给好评!

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/02 20:26:26
写过程,谢谢,我会给好评!

写过程,谢谢,我会给好评!
写过程,谢谢,我会给好评!

 

写过程,谢谢,我会给好评!
计算
(1):23×(-5)-(-3)÷3/128
=-115-(-3)×128/3
=-115-(-128)
=-115+128
=13
(2):-7×(-3)×(-0.5)+(-12)×(-2.6)
=21×(-0.5)+31.2
=-10.5+31.2
=31.2-10.5
=20.7
(3)(1又3/4-7/8-7/12)÷(-7/8)+(-7/8)÷(1又3/4-7/8-7/12)
=(7/4-7/8-7/12)×(-8/7)+(-7/8)÷(7/4-7/8-7/12)
=(42/24-21/24-14/24)×(-8/7)+(-7/8)÷(42/24-21/24-14/24)
=7/24×(-8/7)+(-7/8)÷7/24
=7/24×(-8/7)+(-7/8)×24/7
=(-1/3)+(-3)
=-3又1/3
(4)-|-2/3|-|-1/2×2/3|-|1/3-1/4|-|-3|
=-2/3-1/3-1/12-3
=-1-3-1/12
=-4又1/12