3a 2b 5a 9b-8a
8a+2b+(5a - b) (5a-3b) -3 (a平方 - 2b)
(3a-6b)/(a+b) - (5a-6b)/(a-b) - (4a-5b)/(a+b) - (7a-8b)/(a-b
(3a-6b/a+b)-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a)
对任意自然数a、b,规定a*b=2×a+b.若有:a*2a*3a*4a*5a*6a*7a*8a*9a=2026,则a的值
已知a+b/a-b=b+c/2(b-c)=c+a/3(c-a),求证:8a+9b+5c=0
(a+b)/(a-b)=(b+c)/2(b-c)=(c+a)/3(c-a),abc互不相等,证8a+9b+5c=o
已知2a-a小于3,2a-b小于5,化简|2b-a-7|+|b-2a+8|-|a+b-9|
3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2)]-(3a^2b-8a^2)}=
[(a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a
因式分解(a-b)-3a+3b (a+b)(a-b)-2b(3a-5b)
2(A-B)-3(2A+B)-8(2A-B)+8(2A+B)
解方程组:9(a+b)+(a-b)=25,2(a+b)-(a-b)=8