16-47 28-(-74)

问题描述:

16-47 28-(-74)
(3.8)-(+7) (-5.9)—(6.1)
(+2/5)-(-3/5)   (-2/5)—(-3/5)
 1/2-1/3        (-1/2)-1/3
 -4.2+5.7-8.4+10   -1/4+5/6+2/3+1/2
 12-(-18)+(-7)-15     4.7-(8.9)-7.5+(-6)
  数学有理数加减法  过程和答案都要有.  急

16-47=-(47-16)=-3128-(-74)=28+72+2=100+2=102(3.8)-(+7)=-(7-3.8)=-3.2(-5.9)—(6.1)=-(5.9+6.1)=-12(+2/5)-(-3/5)=2/5+3/5=5/5=1   (-2/5)—(-3/5)=3/5...