急求初一计算题答案!速度

急求初一计算题答案!速度
（0.5）+9/4-2.75+(-11/2)
=
-15+51-16+8
=
-24+3.2-18-3.2+0.3
=
-70/3-61/4+25/4-20/3
=
0-1-[(-1)-(-3/5)-(+5)+(+2/5)]
=
(-18.46)+(-3.16)+1.44+3.16+|-18.46|
=
(-1/2)+4/5+1/2+(-2/3)+(+1/3)
=
(-11/4)+(-12.125)+(0.75)+(+1/8)
=