举例:
竹竿高(m)
2
3
6
影长(m)
1.6
2.4
4.8
①975÷75+15
②1.25×2.3×0.8
③ ×32+13÷
④ ÷[(1﹣ )÷5]
⑤解方程:3x﹣0.4=8
⑥解比例: :y= :2
算式:
420﹣298= 4+5.6= = =
0.25×0.4= 0.133= = =