若a=0.00...024(2009个0),b=0.00...05(2010个0) ①a+b= ②a×b= ③a÷b=

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若a=0.00...024(2009个0),b=0.00...05(2010个0)①a+b=②a×b=③a÷b=若a=0.00...024(2009个0),b=0.00...05(2010个0)①a+

若a=0.00...024(2009个0),b=0.00...05(2010个0) ①a+b= ②a×b= ③a÷b=
若a=0.00...024(2009个0),b=0.00...05(2010个0) ①a+b= ②a×b= ③a÷b=

若a=0.00...024(2009个0),b=0.00...05(2010个0) ①a+b= ②a×b= ③a÷b=
( 1 )a+b=0.00...024+0.00...05=0.00...029(注意数位对齐,2009个0)
(2)a×b=0.00...024×0.00...05=0.00...0120
(根据小数乘法法则,a×b积的小数位数应该有(2009+2)+(2010+1)=4022位,4019个0)
(3)a÷b=0.00...024÷0.00...05=24÷5=4.8(根据小数除法法则,将a、b的小数点同时向右移动2011位,正好是24÷5,而商不变.)

若a、b、c在数轴上的对应点如图所示,且|a|=|b|,(1)计算100-99a-99b; (2)确定(a-b)(b-c)(a-c)的符号;...
www.jyeoo.com/...7-7fee-46ce-8a89-b41af4b26e4e - 2012-10-30 -