知音数学培优题目5795.5795÷5.795×579.5

1.5795.5795÷5.795×579.5=579.5÷5.795×5795.5795 =100×5795.5795=579557.952.9.9×9.9+0.99 =9.9×9.9+9.9×0.1=9.9×（9.9+0.1）=993.0.7777×0.7+0.1111×5.1=0.1111×7×0.7+0.1111×5.1=0.1111×（7×0.7+5...