gosa2(1000000)だとTrueだけど
gosa2(10000000)だとFalse

def gosa2(n):
____a=0
____b=0
____for i in range(n):
________a=round(a+0.1,10)
________b=b+1
____print (a==round(n*0.1,10))
____print (b)