解:
(1)1.21,0.0121,0.000121,0.00000121,121;12100,1210000,121000000;
(2)我发现,每当这个数的小数点向前或向后移动一位,就在小数点的后面或前面增加俩个“0”,不用计算器可以得出0.00011的平方=0.0000000121,110000的平方=12100000000.
解:
(1)1.21,0.0121,0.000121,0.00000121,121;12100,1210000,121000000;
(2)我发现,每当这个数的小数点向前或向后移动一位,就在小数点的后面或前面增加俩个“0”,不用计算器可以得出0.00011的平方=0.0000000121,110000的平方=12100000000.