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
答
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...