题目

递等式计算。(能简算的要简算) (1) 23÷2.5÷0.4 (2) 3.76×3.1+6.9×3.76 (3) (59.8+12.7)÷25 (4) 7-2.65×1.2 (5) 9.21÷0.6-0.39×5 (6) 3.25÷[(7.6+1.5)÷7] 答案: 23÷2.5÷0.4 =23÷(2.5×0.4) =23÷1 =23 3.76×3.1+6.9×3.76 =3.76×(3.1+6.9) =3.76×10 =37.6 (59.8+12.7)÷25 =72.5÷25 =2.9 7-2.65×1.2 =7-3.18 =3.82 9.21÷0.6-0.39×5 =15.35-1.95 =13.4 3.25÷[(7.6+1.5)÷7] =3.25÷[9.1÷7] =3.25÷1.3 =2.5
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