几道数学题！很急！！！！(会加分的！块！)

2/5+(-1/4)-1/5-0.75 (-5)÷2/*9*(-40)*(-0.02)
=(2/5-1/5)-(1/4+3/4) =(-5)÷2*(-40)*(-0.02)*9
=1/5-1 =100*(-0.02)*9
=-4/5 =-18
-1^10-(1+0.5)*(-1/3)÷|-4| -12 3/5-1/4+10 1/4-3 2/5
=-1-1.5*(-1/3)*1/4 ＝[（--12 3/5）+（-3 2/5）]+（10 1/4-1/4）
=1+1/2*1/4 ＝（-16）+10
=1+1/8 ＝-6
=1又1/8
-5÷3/7*4/7÷(-20/3) 19 19/20*(-60)
＝-5*7/3*4/7*(-3/20) =(20-1/20)*(-60)
=(-5)*(-3/20)*7/3*4/7 =20*(-60)-1/20*(-60)
=1 =-1200-3
=-1203
-1^2-[1 3/7+(-12)÷6]^2*(-3/4)^3 (-3)^3÷9/4*(-2/3)^2+4-2^2*(-1/3)
=-1-[1 3/7+(-2]^2*(-27/64) =(-27)*4/9*4/9-4*(-1/3)
=-1-16/49*(-27/64) =(-16/3)+4/3
=-1+27/98 =-4
=-71/98