新龙小学有20位老师带领206名学生参观海洋世界,现有8000元钱,买门票够不够?
脱式计算: (7.5+2.5)×0.25475÷25÷45.4÷18+12 999×1999+9992.25×1.8+17.5×0.18[1﹣(+)]×36.
25×0.4+1.69÷1.3 17.8×0.8+17.8×0.2 10.1×9.8.
能简算的用简便方法算. 2.5×3.4×0.48.24﹣2.68﹣1.326.5×2.3+6.5×6.7+6.5 7.8÷0.25÷41.37×992.5×32×1.25.
能简算的用简便方法算. 9.28+1.82÷0.7(71.2﹣71.2×0.9)÷0.256.5×2.3+6.5×6.7+6.5 7.8÷0.25÷41.37×99+1.374.8×6.2﹣12.4.
怎样算简便就怎样算. (1)4.32+5.43+6.68(2)15.17﹣6.8﹣3.2(3)34.82﹣(4.82+15.2) (4)15.27+4.72﹣5.28(5)4.02﹣3.5+0.98(6)5.8﹣4.5+5.8﹣4.5.