問(wèn)答題用改進(jìn)歐拉法和梯形法解初值問(wèn)題y′=x2+x-y,y(0)=0取步長(zhǎng)h=0.1,計(jì)算到x=0.5,并與準(zhǔn)確解y=-e-x+x2-x-1相比較.

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