2000减3减6减9减·········减51减54等于多少

2000减3减6减9减·········减51减54等于多少 如果3x＋9.8,那么15x减6等于（ ）·····打错了······················3x＋8等于9,那么15x减6等于（ ） 若多项式x的平方加3x减5的值为2,求多项式2乘x平方加6x减3的值急····························· 负1加2减3加4减5加·······加100 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? 根号26/27减1的立方根急······谢啦 互为相反数的2个数相减等于多少急······ 一减七分之一减六分之一减五分之一减四分之一减三分之一减二分之一速度····· 解方程····求大神解决····11分之7减x=三分之一 2012减2011加2010减2099加······加4减3加2减1怎么简便计算 用加,减,乘,除和括号连接各数,使等式成立.1 2 3 4 5 =1不能用负数.急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急急····························· ···· · · · ···· 五十分之一减一×四十九分之一减一······×二分之一减一帮个忙 用紧张,······················紧张,······················紧张,······················造句,内容是要积极向上的~3Q