3.2*1.8+2.54和198*0.51簡便運算

題目：

3.2*1.8+2.54和198*0.51簡便運算

解答：

3.2*2-3.2*0.2+2.54
=6.4-0.64+1.9+0.64
=6.4+1.9
=8.3
198*0.51
=198*0.5+198*0.01
=99+1.98
=100.98