2.42÷ 15×(6- 1)
3.8÷3×3 1 = 9 8 65438+9 0-8 = 65438+9 0.
4.240× 3/4 1.
5.44 3 70 5 18 4 3 72 7 0.9 4 3.
6.x = 65438+3/09 x = 65438+7/00,3/2,9/7。
7.6 ÷ 3× 1 50 points in total.