69+699+6999+69999+699999=?(用简便方法计算)
问题描述:
69+699+6999+69999+699999=?(用简便方法计算)
答
69+699+6999+69999+699999=70+700+7000+70000+700000-5=777765
69+699+6999+69999+699999=?(用简便方法计算)
69+699+6999+69999+699999=70+700+7000+70000+700000-5=777765