设向量<img src="/lqwvjeImg/f3/f3814cfcb4ce6f766df23ef2edee0316.png">=(-1,4),<img src="/lqwvjeImg/2d/2d32b27fc5b812e842e43b40862f114d.png">=(1,-2),<img src="/lqwvjeImg/a1/a15ed732af12b14fa2b60ec58f46b175.png">=(3,-8),若有常数a,b使a<img src="/lqwvjeImg/f3/f3814cfcb4ce6f766df23ef2edee0316.png">-b<img src="/lqwvjeImg/2d/2d32b27fc5b812e842e43b40862f114d.png">-<img src="/lqwvjeImg/a1/a15ed732af12b14fa2b60ec58f46b175.png">=0,则( )<br>·<img src="/lqwvjeImg/ae/ae160e65a12306de4f754d859811bad0.png"><br>·a=-1,b=2<br>·a=1,b=-2<br>·a=1,b=2