1.7×0.9+1.2÷0.3-0.2=48.8這個括弧怎麼加才能使算式成立啊! 1.7×0.9+1.2÷0.3-0.2=48.8 2.7×0.9+1.2÷0.3-0.2=18.3 3.7×0.9+1.2÷0.3-0.2=75 4.7×0.9+1.2÷0.3-0.2=47.6共有四個,

1.7×0.9+1.2÷0.3-0.2=48.8這個括弧怎麼加才能使算式成立啊! 1.7×0.9+1.2÷0.3-0.2=48.8 2.7×0.9+1.2÷0.3-0.2=18.3 3.7×0.9+1.2÷0.3-0.2=75 4.7×0.9+1.2÷0.3-0.2=47.6共有四個,

1.7×(0.9+1.2)÷0.3-0.2=48.8
2.7×0.9+1.2÷(0.3-0.2)=18.3
3.(7×0.9+1.2)÷(0.3-0.2)=75
4.7×[(0.9+1.2)÷0.3-0.2]=47.6