(1/3)如果要比较x与y的大小,只要作差x-y,若x-y>0,则x>y;若x-y=0,则x=y;若x-yy;若x-y=0,则x=y;若x-y

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(1/3)如果要比较x与y的大小,只要作差x-y,若x-y>0,则x>y;若x-y=0,则x=y;若x-yy;若x-y=0,则x=y;若x-y

(1/3)如果要比较x与y的大小,只要作差x-y,若x-y>0,则x>y;若x-y=0,则x=y;若x-yy;若x-y=0,则x=y;若x-y
(1/3)如果要比较x与y的大小,只要作差x-y,若x-y>0,则x>y;若x-y=0,则x=y;若x-yy;若x-y=0,则x=y;若x-y

(1/3)如果要比较x与y的大小,只要作差x-y,若x-y>0,则x>y;若x-y=0,则x=y;若x-yy;若x-y=0,则x=y;若x-y
a^4)+(b^4)-(a^3)b+a(b^3)
=(a^3)(a-b)-(b^3)(a-b)
=(a-b)[(a^3)-(b^3)]
接(2/3)

(a^4)+(b^4)-(a^3)b+a(b^3)
=(a^3)(a-b)-(b^3)(a-b)
=(a-b)[(a^3)-(b^3)]
接(2/3)