1.能简算的要简算.
| $\frac{2}{3}$+$\frac{3}{2}$ | $\frac{7}{8}$-$\frac{3}{4}$ | $\frac{13}{22}$-$\frac{12}{33}$ | $5-\frac{3}{7}-\frac{4}{7}$ |
| $\frac{1}{6}+\frac{3}{8}+\frac{5}{8}$ | $\frac{11}{12}$+$\frac{5}{8}$+$\frac{1}{8}$+$\frac{1}{12}$ | $\frac{7}{9}$-($\frac{1}{3}$+$\frac{4}{9}$) | 5+7+9+11+13+15+17+19+21. |
12.张老师买了4个文具盒,每个8元,又买了一支钢笔花了12元,张老师一共花了多少元?列式正确的是( )
0 134658 134666 134672 134676 134682 134684 134688 134694 134696 134702 134708 134712 134714 134718 134724 134726 134732 134736 134738 134742 134744 134748 134750 134752 134753 134754 134756 134757 134758 134760 134762 134766 134768 134772 134774 134778 134784 134786 134792 134796 134798 134802 134808 134814 134816 134822 134826 134828 134834 134838 134844 134852 199269
| A. | 4+8×12 | B. | (4+8)×12 | C. | 4×8+12 |