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.
答
(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.