2x的5次方·(-x²-(-2x²)³·(-2分之1x),(2×10²)³×(3×10³)²-(4×10的4次方)³,[2分之1(x-y)]³·[2(y-x)]²·[-3分之2(y-x)²]),

2x的5次方·(-x²-(-2x²)³·(-2分之1x),
(2×10²)³×(3×10³)²-(4×10的4次方)³,[2分之1(x-y)]³·[2(y-x)]²·[-3分之2(y-x)²]),

(2×10²)³×(3×10³)²-(4×10的4次方)³,
=8×10^6*9×10^6-64×10^12
=72×10^12-64×10^12
=8×10^12
[2分之1(x-y)]³·[2(y-x)]²·[-3分之2(y-x)²])
=1/8(X-Y)^3*4(X-Y)^2*［-2/3(X-Y)^2］
=-1/3(X-Y)^7.