若△ABC与△A′B′C′全等,则AB=A′B′.( )
判断题(对的打“∨”,错的打“×”)(1)=3.14- ( ) (2)=32×5=135 ( )(3)== ( ) (4)== ( )
下列由左到右的变形哪些是因式分解,哪些不是(是的打“∨”,不是的打“×”):(1)(x+3)(x-3)=x2-9; ( ); (2)x2+2x+2=(x+1)2+1;( )(3)x2-x-12=(x+3)(x-4);( ); (4)x2+3xy+2y2=(x+2y)(x+y);( )(5)1-=(1+)(1-);( );(6)m2++2=(m+)2;( )(7)a3-b3=(a-b)(a2+ab+b2).( )
判断题(对的打“∨”,错的打“×”)(1)-4ab2÷2ab=2b;( ) (2)12a2b3c÷6ab2=2ab;( )(3)4a5b4÷2a3b=2a2b3;( ) (4)6a7b8÷2a3b4·3a4b4=4a7b8÷6a7b8=1.( )
判断题(对的打“∨”,错的打“×”)(1)a9÷a3=a3; ( ) (2)(-b)4÷(-b)2=-b2;( )(3)s11÷s11=0;( ) (4)(-m)6÷(-m)3=-m3;( )(5)x8÷x4÷x2=x2;( ) (6)n8÷(n4×n2)=n2.( )
判断题(对的打“∨”,错的打“×”)(1)(-1)0=-10=-1;( ) ;( )(3)-(-2)-1=-(-2-1);( ) (4)5x-2=.( )