递等式要巧算 0.3+0.3÷0.3-0.3×0.3 1.2÷1.25
递等式要巧算 0.3+0.3÷0.3-0.3×0.3 1.2÷1.25
日期：2011-12-08 17:40:28 人气：1
0.3+0.3÷0.3-0.3×0.3
=0.3+1-0.9
=0.3+0.1
=0.4
1.2÷1.25
=6/5÷10/8
=6/5×8/10
=48/50
=96/100
=0.96
递等式要巧算 0.3+0.3÷0.3-0.3×0.3 1.2÷1.25