UC知道求教几道sat数学题
来源：百度知道 编辑：UC知道 时间：2024/07/04 03:56:24
是真题上的
the number n is a 2-digit number. when n is divided by 10, the remainder is 9, and when n is divided by 9, the remainder is 8.what is the value of n?
第二题
if x^2+kx+15=(x+t)(x+5),for all values of x. and if k and t are constants,what is the value of k
the number n is a 2-digit number. when n is divided by 10, the remainder is 9, and when n is divided by 9, the remainder is 8.what is the value of n?
第二题
if x^2+kx+15=(x+t)(x+5),for all values of x. and if k and t are constants,what is the value of k
第一题，显然这个数字是10x+9，那么除以9的remainder就是x了（原数为9x+9+x），所以就是89
第二题，韦达定理，或者把右式展开，用待定系数法，t=3，k=8
by the way，这都是SAT2的题吧
89 这个稍微试想一下就出来了，我觉得sat数学很多题这样比较快
8 把前半个式子按十字交叉法写一下，或者后半个展开就可以了