(1+19/92)+(1+19/92×2)+(1+19/92×3)+…(1+19/92×10)+(1+19/92×11)的结果是x,那么与x最接近的整数是_.
问题描述:
(1+
)+(1+19 92
×2)+(1+19 92
×3)+…(1+19 92
×10)+(1+19 92
×11)的结果是x,那么与x最接近的整数是______. 19 92
答
x=(1+1992)+(1+1992×2)+(1+1992×3)+…+(1+1992×10)+(1+1992×11),=1×11+(1+2+3+…+10+11)×1992,=11+(1+11)×11÷2×1992,=11+66×1992,=11+13.63,=24.63;因此,与x最接近的整数是25.故答...