问题
解答题
计算:
①15.6789÷20÷5=______
②34.5×8.23-34.5+2.77×34.5=______
③0.9999×0.7+0.1111×2.7=______.
答案
①15.6789÷20÷5
=15.6789÷100
=0.156789;
②34.5×8.23-34.5+2.77×34.5
=34.5×(8.23+2.77-1)
=34.5×10
=345;
③0.9999×0.7+0.1111×2.7
=0.9999×0.7+0.9999×0.3
=0.9999×(0.7+0.3)
=0.9999;
故答案为0.156789;345;0.9999.