例:2.1×9=18.9;3.21×9=28.89;4.321×9=38.889;5.4321×9=48.8889
例:2.1×9=18.9;3.21×9=28.89;4.321×9=38.889;5.4321×9=48.8889...
68.888889
2.3+2.5=4.8=两个2.4,再加上原式的3个2.4共5个2.4相加,所以原式=2.4x5=120。第=题(1)=2.1X9=18.9,2)=3.21x9=28.89,3)=4.321X9=38.889,4)=5.4321x9=48.8889,5)=6.54321x9=58.88889……
68.888889
2.3+2.5=4.8=两个2.4,再加上原式的3个2.4共5个2.4相加,所以原式=2.4x5=120。第=题(1)=2.1X9=18.9,2)=3.21x9=28.89,3)=4.321X9=38.889,4)=5.4321x9=48.8889,5)=6.54321x9=58.88889……