若3a+2b=4,2a-b=5,则5a+b=______.
若3a+2b=4,2a-b=5,则5a+b=______.
若a-2b=3,则2a-4b-5=______.
3a+2b+5=10.8,则6a+4b-5=______.
若100a=5,10b=2,则2a+b=______.
若a:3=b:4=c:5,且a+b-c=6,则a=______,b=______,c=______.
若a+2b-3c=4,5a-6b+7c=8,则9a+2b-5c=______.
若a-2b+3c=7,4a+3b-2c=3,则5a+12b-13c=______.
若a+b=3,ab=-2,则(4a-5b-3ab)-(3a-6b+ab)=______.
若3a+2b=5,则(4a+7b)-(3b-2a)=______.
已知A=a2-ab,B=ab+b2,则A+B=______,A-B=______,3A-2B=______.
设集合A={5,log2(a+3)},B={a,b}.若A∩B={1},则A∪B=______.
若a,b满足|a+5b-2|+(a+b-6)²=0,求代数式(a-3b)(a+2b)-(a+5b)(a+3b)