这两道题怎么写?
1个回答
展开全部
(1)-3-[-5+(1-2×3/5)÷(-2)]÷0.1
=-3-[-5+(1-1.2)÷(-2)]÷0.1
=-3-[-5-0.2÷(-2)]÷0.1
=-3-[-5+0.1]÷0.1
=-3+4.9÷0.1
=-3+49
=46
(2)(2/3-1/2-5/6)×12-1.45×8+3.95×8
=(2/3×12-1/2×12-5/6×12)+(-1.45+3.95)×8
=(8-6-10)+2.5×8
=-8+20
=12
=-3-[-5+(1-1.2)÷(-2)]÷0.1
=-3-[-5-0.2÷(-2)]÷0.1
=-3-[-5+0.1]÷0.1
=-3+4.9÷0.1
=-3+49
=46
(2)(2/3-1/2-5/6)×12-1.45×8+3.95×8
=(2/3×12-1/2×12-5/6×12)+(-1.45+3.95)×8
=(8-6-10)+2.5×8
=-8+20
=12
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