2.十進制計算
1.07+3.54+0.93+5.462.5×16.8×0.04
0.875×36+5.6+3.5?0.8×[(40.5÷8.1)÷8]
3.28×8.4+67.2×0.84?0.18×[(12.5+1.5)÷2.5]
3.解方程
4.2×8-0.3x=31.5？2.5x-5=0.38+0.62
6x÷3=54.62+23x=117
4.分數計算