给下面的算式添上括号,使等式成立. (1)7×0.9+1.2÷0.3-0.2=48.8 (2)7×0.9+1.2÷0.3-0.2=147 (3)7×0.9+1.2÷0.3-0.2=75 (4)7×0.9+1.2+0.3-0.2=32.9.

问题描述:

给下面的算式添上括号,使等式成立. 
(1)7×0.9+1.2÷0.3-0.2=48.8     
(2)7×0.9+1.2÷0.3-0.2=147 
(3)7×0.9+1.2÷0.3-0.2=75     
(4)7×0.9+1.2+0.3-0.2=32.9.

(1)7×[(0.9+1.2)÷0.3]-0.2=48.8,
(2)7×(0.9+1.2)÷(0.3-0.2)=147,
(3)(7×0.9+1.2)÷(0.3-0.2)=75,
(4)7×(0.9+1.2÷0.3-0.2)=32.9.