题目内容
判断题(对的打“∨”,错的打“×”):
(1)x3•x5=x15;______
(2)x3•x5=x8;______
(3)x3+x5=x8;______
(4)x2•x2=2x4;______
(5)a3•a2-a2•a3=0;______
(6)y7+y7=y14.______.
(1)x3•x5=x15;______
(2)x3•x5=x8;______
(3)x3+x5=x8;______
(4)x2•x2=2x4;______
(5)a3•a2-a2•a3=0;______
(6)y7+y7=y14.______.
(1)x3•x5=x8;故错误;
(2)x3•x5=x8;故正确;
(3)x3+x5≠x8;故错误;
(4)x2•x2=x4;故错误;
(5)a3•a2-a2•a3=a5-a5=0;故正确;
(6)y7+y7=2y7;故错误.
故答案为:(1)×,(2)√,(3)×,(4)×,(5)√,(6)×.
(2)x3•x5=x8;故正确;
(3)x3+x5≠x8;故错误;
(4)x2•x2=x4;故错误;
(5)a3•a2-a2•a3=a5-a5=0;故正确;
(6)y7+y7=2y7;故错误.
故答案为:(1)×,(2)√,(3)×,(4)×,(5)√,(6)×.
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