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(﹣2a2b3)÷(﹣2ab)=a2b2 (3x2y﹣6xy)÷6xy=0.5x (21x5y2﹣9x4y3)÷3x3y2=7x2﹣3xy (3x2y+xy)÷xy=3x
={x||x-1|<2}, ={y|y=2x,x∈[0,2]},则A.∩B.= A.[1,3)B.(1,3) [0,2] (1,4)
={x||x-1|<2}, ={y|y=2x,x∈[0,2]},则A.∩B.= ( ) A.[0,2]B.(1,3) [1,3) (1,4)
={x||x-1|<2}, ={y|y=2x,x∈[0,2]},则A.∩B.=( ) A.[0,2]B.(1,3) [1,3) (1,4)
={x|x2-2x-3<0}, ={y|y=2x,x∈[0,2]},则A.∩B=( ) A.[0,2]B.(1,3) [1,3) (1,4)
2x + y = 3z 2x —=2 2xy—3y = 0 3x—5y=2
与多项式 =2x2-3xy-y2的和是多项式 =x2+xy+y2,则A.等于( ) A. x2-4xy-2y2 B. -x2+4xy+2y2 C. 3x2-2xy-2y2 3x2-2xy
={x||x-1|<2}, ={y|y=2x,x∈[0,2]},则A.∩B.=( ) A.[0,2]B.(1,3) [1,3) (1,4)
3x﹣4=7﹣x 2x+5y=10 xy﹣1=0 3x=1
y=x2+2 y=3x2 y=cx2 y=x2+c