已知A=(3,5,-1),b=(2,2,3),c=(4,-1,-3),则2a=____;a+b-c=____,2a-3b+4c=____,ma+nb=____.
已知A=(3,5,-1),b=(2,2,3),c=(4,-1,-3),则2a=____;a+b-c=____,2a-3b+4c=____,ma+nb=____.
【正确答案】:(6,10,-2);(1,8,5);(16,0,-23);(3m+2n,5m+2n,-m+3n)
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