运算规则:有括号,先算括号内。没括号,先算乘除,再算加减。脱式计算:1.55/0.2+1.45*5=7.75+7.25=15
你好!解:1.55÷0.2+1.45×5=1.55×5+1.45×5=(1.55+1.45)×5=3×5=15
1.55÷0.2+1.45*5=1.55÷1/5+1.45*5=1.55*5+1.45*5=(1.55+1.45)*5=3*5=15