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.口算训练 + = = = - = + = + = + = + = + = + = = = - = 1 + = 2.54= 1.2580= 1 = = = = = = = = 4 = 17 = 10 = 12 = 8= 12= 81.25= 9917= 10.25= 14 = 5= 1= 25= 30 = =5X+X= n + n= - = m- m= + = = + = = = = - = + = = -= -= += = = += = .
