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12+32/(-2)^3-(-4)^2*515/(-5)+15/(-3)15/[(-5)*(-3)]15/[(-5)^2-3^2](-0.25)^2/[3又1/2-(-1+3又1/4)]*0.4(-1)^2001*{[(-1)^2+1]*(-1)-1}-1-1^4-(2-0.5)*1/3*[(-1/2)^2-(1/2)^3](-1/30)/(2/3-1/10+1/6+2/5)(-1)+2+(-3)+4+...+(-99)+1002+(-4)+6+(-8)+...+18+(-20)

题目详情









▼优质解答
答案和解析
12+32/(-2)^3-(-4)^2*5
=12+32/(-8)-15*5
=12+(-4)-75
=8-75
=-67
15/(-5)+15/(-3)
=-15/5+(-15/3)
=-3+(-5)
=-3-5
=-8
15/[(-5)*(-3)]
=15/15
=1
15/[(-5)^2-3^2]
=15/(25-9)
=15/16
(-0.25)^2/[3又1/2-(-1+3又1/4)]*0.4
=0.0625/[3.5-(-2.25)]*0.4
=0.0625/5.75*0.4
=0.01*0.4
=0.004
(-1)^2001*{[(-1)^2+1]*(-1)-1}-1
=-1*[(1+1)*(-1)-1]-1
=-1*[2*(-1)-1]-1
=-1*[(-2)-1]-1
=-1*(-3)-1
=3-1
=2
-1^4-(2-0.5)*1/3*[(-1/2)^2-(1/2)^3]
=-1-1.5*1/3*(1/4-1/8)
=-1-3/2*1/3*1/4
=-1-1/2*1/4
=-1-1/8
=-1又1/8
(-1/30)/(2/3-1/10+1/6+2/5)
=-1/30/[(20-3+5+12)/30]
=-1/30/(34/30)
=-1/30*30/34
=-1/34
(-1)+2+(-3)+4+...+(-99)+100
=[(-1)+(-3)+(-5)+...+(-99)]+(2+4+6+...+100)
=50*[(-1)+(-99)]/2+50*(2+100)/2
=50*(-100)/2+50*102/2
=-2500+2550
=50
2+(-4)+6+(-8)+...+18+(-20)
=(2+6+10...+18)+[(-4)+(-8)+(-12)+...+(-20)]
=5*(2+18)/2+5*[(-4)+(-20)]/2
=5*20/2+5*(-24)/2
=5*10+5*(-12)
=50+(-60)
=-10