-3.75+2.85+1又4分之1+{-2分之1}+3.15+{-2.求了开
问题描述:
-3.75+2.85+1又4分之1+{-2分之1}+3.15+{-2.求了开
答
-3.75+2.85+1又4分之1+{-2分之1}+3.15+{-2.5}
= -3.75+1又4分之1+(2.85+3.15)+(-1/2)+(-2.5)
= -2.5+6+(-3)
= 0.5