5+(-7)= -53+17= 13+(-6)= 31+(-61)= 36+(-13)= -24+16=
-51+(-34)= 42.43+(-17.5)=
(-8)+10+2+(-1)=
答案:-2 -36 7 -30 23 -8 -85 24.93 3
您自己检查,不一定全对!
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