①4.12+ 1.37+ 0.88 + 3.63
②3.12÷2.5÷0.4
③48×()
④802-11×36
⑤0.56÷ (0.71+ 2.09)
⑥
⑦(0.84÷0.4+ 2.9)×0.4
⑧
+25%= 1.5× = ÷2= 1÷ - ÷1=
1.25×2.4= 10-10%= ÷ =
400毫升是200毫升的%;
10万吨是2000万吨的%.
右边刻度
1
2
3
4
砝码数
6
乘积
路程(km)
0
50
100
150
200
250
…
耗油量(L)
5
10
15
20
25
1-0.92= - = ×3.2= ÷ ×5=
3.5+4.28= × = ÷ = 99×0.9+0.9=