1.=5.2+4.8-(2又六分之一+4又六分之五)
=10-7=3
2.=-9.2+7.4+9.2-0.4-4+3
=7.4-0.4-1=6
3.=-728/17+(-4/3)*(-1/4)
=-728/17+1/3
=-2167/51
4.=-3.61*0.75+0.61*0.75+0.2*0.75=0.75*(-3.61+0.61+0.2)
=0.75*3.2=四分之三*3.2=2.4
5.=(5/6-2/3+4/7-5/14)(-1/42)
=(1/6+3/14)(-1/42)
=(7/42+9/42)(-1/42)
=16/42*(-1/42)
=-4/441
6.=(-12)*(-1/3-1/6+2/5-3/10)
=-12*(-1/2+1/10)
=-12*(-0.4)
=4.8
7.=-2.5/(-10)*(-10/3)/(-5/12)
=-2.5*12/(3*-5)
=0.5*4
=2
8.=-9-3+(1/2-2/3)*12-9
=-21-2
=-23
9.=-1-(-7)/2
=-1+3.5
=2.5
10.=(-5)^2+8*9+6/(1/9)
=25+72+54
=151
貌似第三题抄错了吧?