(1)÷(-)-×(-)-÷2×=-1+-=-6; (2)-32-[22÷(-1)-13]×(-2)÷(-1)2008=-9-(-3-13)×(-2)=-9-32=-41; (3)x2+3x2+x2-3x2=2x2; (4)5(a2b-2ab2+c)-4(2c+3a2b-ab2)=5a2b-10ab2+5c-8c-12a2b+4ab2=-7a2b-6ab2-3c; (5)x2+4x-(2x2-x+x2)-(3x-1)=x2+4x-2x2+x-x2-3x+1=-2x2+2x+1, 当x=-3时,原式=-2×(-3)2+2×(-3)+1=-41. |