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