求大神帮我.①(-8)+10+2+(-1) ②5+(-6)+3+9+(-4)+(-7求大神帮我.①(-8)+10+2+(-1)②5+(-6)+3+9+(-4)+(-7)③(一0.8)+1.2+(-0.7)+(一2.1)+0.8+3.5

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求大神帮我.①(-8)+10+2+(-1)②5+(-6)+3+9+(-4)+(-7求大神帮我.①(-8)+10+2+(-1)②5+(-6)+3+9+(-4)+(-7)③(一0.8)+1.2+(-0.7

求大神帮我.①(-8)+10+2+(-1) ②5+(-6)+3+9+(-4)+(-7求大神帮我.①(-8)+10+2+(-1)②5+(-6)+3+9+(-4)+(-7)③(一0.8)+1.2+(-0.7)+(一2.1)+0.8+3.5
求大神帮我.①(-8)+10+2+(-1) ②5+(-6)+3+9+(-4)+(-7
求大神帮我.①(-8)+10+2+(-1)
②5+(-6)+3+9+(-4)+(-7)
③(一0.8)+1.2+(-0.7)+(一2.1)+0.8+3.5

求大神帮我.①(-8)+10+2+(-1) ②5+(-6)+3+9+(-4)+(-7求大神帮我.①(-8)+10+2+(-1)②5+(-6)+3+9+(-4)+(-7)③(一0.8)+1.2+(-0.7)+(一2.1)+0.8+3.5
3 0 1.9 我口算的,不知道对不对

(1)—1 (2)0 (3)1.9

①(-8)+10+2+(-1)=3
②5+(-6)+3+9+(-4)+(-7)=0
③(一0.8)+1.2+(-0.7)+(一2.1)+0.8+3.5=1.9


(-8)+10+2+(-1)
=2+2-1
=4-1
=3

5+(-6)+3+9+(-4)+(-7)
=-1+3+9-4-7
=2+9-4-7
=11-4-7
=7-7
=0

(一0.8)+1.2+(-0.7)+(一2.1)+0.8+3.5
=0.4-0.7-2.1+0.8+3.5
=-0.3-2.1+0.8+3.5
=-2.4+0.8+3.5
=-1.6+3.5
=1.9