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54点吧5减括号4.13加4.85括号用简便竖式计算

54.85-(4.13+4.85) =(54.85-4.85)-4.13 =50-4.13 =45.87

原式=37.2-9.3     =4

54÷(1.7+2.1+3.4) =54÷7.2 =(18×3)÷(18×0.4) =3÷0.4 =7.5

薇薇一笑倾城

(31.6-11.7)/2.5/0.4=(31.6-11.7)/1=19.9

三十点二减括号四点八六加七点五四 =30.2-(4.87+7.54) =30.2-4.87-7.54 =17.2+5+8-4.87-7.54 =17.2+5-4.87+8-7.54 =17.2+(5-4.87)+(8-7.54) =17.2+0.13+0.46 =17.33+0.46 =17.79

∵54.4÷4=13.6 ∴4×13.6=54.4

54.6-(-3/4)+1.6-3/4 =54.6+3/4+1.6-3/4 =54.6+1.6+(3/4-3/4) =56.2+0 =56.2

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