0.5x²-1/5x³,其中x=12/13

0.5x²-1/5x³,其中x=12/13
0.5x²-1/5x³,其中x=12/13

0.5x²-1/5x³,其中x=12/13
0.5x²-1/5x³
=1/10x²(5-2x)
=1/10×144/169×（5-24/13）
=1/5×72/169×41/13
=2952/10985

0.5x²-1/5x³
=x²(0.5-1/5x)
=(12/13)²[(1/2)-(1/5)(12/13)]
=(12/13)²(1/2-12/65)
=(12/13)²(65/130-24/130)
=(12/13)²(41/130)
=(144/169)(41/130)
=(72/169)(41/65)
=2952/10985