1.（3m-n-p)（3m+n-p)2.-(x+y)^2-2(x-y)(x+y) 3.(-2x-y)^2-(-x-y)(x-y)-2(x-y)(x+2y) 4.(2m^4n^3+16m^3n-2m^2n)/(-2m^2n) 5.-9.9*10.16.5^10*3^2*2^9 7.123^2-124^3*1228.39+[-23]+0+[-16]= 0 9.[-18]+29+[-52]+60= ...