化简:5a-2a=______.
如果4A=5B,那么A:B=______:______,A和B成______比例.
已知2a+2-a=3,则8a+8-a=______.
如果A×3=B×5那么A:B=______:______.
如果3a=5b,那么a:b=______:______.
如果3a=2b,那么a:b=______:______.
(2012•黄埔区一模)化简:a-2(a-1)=______.
如果a+b+c=180,b=a+c,a=2c,那么 a=______,b=______,c=______.
已知A=a2-ab,B=ab+b2,则A+B=______,A-B=______,3A-2B=______.
两个非0自然数a、b,若5a=b,那么a与b的最大公因数是______,a:b=______:______.
若100a=5,10b=2,则2a+b=______.
3a+2b+5=10.8,则6a+4b-5=______.
若3a2-a-2=0,则5+2a-6a2=______.