问题
选择题
下列计算正确的是( )
A.2x2•3x3=6x6
B.x3+x3=x6
C.(x+y)2=x2+y2
D.(x3)m÷x2m=xm
答案
A、应为2x2•3x3=6x5,故本选项错误;
B、应为x3+x3=2x3,故本选项错误;
C、应为(x+y)2=x2+2xy+y2,故本选项错误;
D、正确.
故选D.
下列计算正确的是( )
A.2x2•3x3=6x6
B.x3+x3=x6
C.(x+y)2=x2+y2
D.(x3)m÷x2m=xm
A、应为2x2•3x3=6x5,故本选项错误;
B、应为x3+x3=2x3,故本选项错误;
C、应为(x+y)2=x2+2xy+y2,故本选项错误;
D、正确.
故选D.