8^a=16,8^b=1/4,求9^a÷3^2b
(2a+b)(a-b)=8 求a,b
如果a-2b/a+2b=3,求a+2b/a-2b+3a-6b/4a+8b
(a-2b)/(a+2b)=3,求(a+2b)/(a-2b)+(3a-6b)/(4a+8b)的解,
已知2a-b+1的绝对值+(3a+3/2b)^=0,求(b^/a+b)÷{[(b/a-b)+1][a-(a^/a+b)]
a-b\a+b=1\2时,求代数式a+b\3(a-b) - a-b\2(a+b)
a-2b/a+2b=3,求2+2b/a-2b+3a-6b/4a+8b的值
已知25a2-10a+1+|4b+1|=0,求[(4a+3b)(4a-3b)-(2a-5b)(8a+5b)]÷(-2b)
1.已知|a-2|+b*b+8b+16=0,求b*b的值.2.已知a*a+a+1=0,求a*a*a+2a-3的值
空间向量已知a=(2,-3,5),b==(-3,1,-4),求a+b,a-b,8a,a*b,
a(a-1)-(a×a-b)=-5,求(a×a+b×b)÷2-ab
1,已知3a-b=6,求[(4a平方+b平方)-(2a-b)平方+2b(a-b)]÷b,
已知根号2a-1+|b+2|=0,求(2a+b)(2a-b)+b(2a+b)-4a^2b÷b的值