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(1,a,-5), (2a,-7,-2),则|AB|的最小值为( ) A.3B.3 2 2
2x+3y=5xy -2ba2+a2b=-a2b 2a2+2a3=2a5 4a2-3a2=1
a5+a5=a10 a3÷a﹣1=a2 a•2a2=2a4 (﹣a2)3=﹣a6
3x2﹣x2=3 3a2+2a3=5a5 3+x=3x ﹣0.25ab+ba=0
a2+a3=a5 (-2a2)3=-6a6 (2a+1)(2a-1)=2a2-1 (2a3-a2)÷a2=2a-1
a2﹣(1﹣2a)=a2﹣1﹣2a a2+(﹣1﹣2a)=a2﹣l+2a a﹣[5b﹣(2c﹣1)]=a﹣5b+2c﹣1 ﹣(a+b)+(c﹣d)=﹣a﹣b﹣c+d
(2ab)2=2a2b2 (a+b)2=a2+b2 a5+b5=2a10 (a2+a)÷a=a+1
2a+3b=5ab; a3-a2=a; a2+2a2=3a2; (a-1)0=1.
﹣40=1 2a(a+1)=2a2+2a (a+b)﹣1=a﹣1+b﹣1 (y﹣2x)(y+2x)=y2﹣2x2
2x+3y=5xy 2a2+2a3=2a5 4a2﹣3a2=1 ﹣2ba2+a2b=﹣a2b
2+=2 =2 (﹣2a2)3=﹣6a6 (a+1)2=a2+1