若a,b满足{a+2b=8,2a+b=7则a-b=

若a,b满足{a+2b=8,2a+b=7则a-b= 若非零向量a,b满足/a+b/=/b/,证明/2b/>/a+2b/ 若实数a,b满足|3a-1|+|b-2|=0,求(a+b)×|-b|/7的值 设向量a,b满足|a|=|b|及|3a-2b|=√7 若正数a,b满足a+b=1,则a^2+b^2的最小值 若实数a,b满足a+b=2,求3^a+3^b的最小值 若实数a,b满足a+b=2则3^a+3^b最小值是 若实数a,b满足等式a^2=7-3a,b^2=7-3b,则代数式b/a+a/b的值是什么 若a、b为有理数,且a、b满足a+2b+√5=7+(a+b)√5,求a+b的n次方根 已知：实数a、b（a≠b)满足a^2-7a+5=0,b^2-7b+5=0,则b/a+a/b=? 若向量a,b满足:|a|=1,(a+b)⊥a,(2a+b)⊥b则|b|=A.2 B.根号2 C.1 若a、b 满足a²+b²+4/5=a-2b 求2a-3b 若实数a,b满足a*b-4*a-b+1=0求(a+1)*(b+2)的最小值 若非零向量a,b满足/a+b/=/b/,则若非零向量a.b满足|a+b|=|b|,则 A.|2a|>|2a+b| B.|2a||a+2b| D.|2b| 6.若非零向量a b满足|a-b|=|b|,则A.|2b|>|a-2b|B.|2b||2a-b|D.|2a| 若非零向量a b满足|a-b|=|b|,则A.|2b|大于|a-2b|B.|2b||2a-b|D.|2a| 若非零向量a,b满足/a+b/=/b/,则A /2a/>/2a+b/B /2a//a+2b/D /2b/ 非零向量a,b满足|a+b|=|b| ,则：A.|2a|>|2a+b| B.|2a||a+2b| D.|2b|