初出茅庐
180 - 90 =
270 - 180 =
45 + 45 =
180 + 35 =
75 + 28 =
20 + 90 =
90 + 90 =
100 - 90 =
30 + 30 =
150 + 30 =
180 - 35 =
115 - 15 =
60 + 60 =
120 + 45 =
90 - 45 =
90 - 30 =
60 + 30 =
100 + 80 + 20 =
180 - 30 - 60 =
90 + 45 + 45 =
70 + 20 + 90 =

过关斩将
分别画出下列三角形底边上的高。

登台拜将
70 ÷ 5 + 5 =
200 ÷ 2 + 20 =
7 × 3 + 13 =
100 - 16 × 5 =
41 × 1000 =
45 × 4 - 80 =
125 ÷ 5 - 12 =
48 ÷ 3 + 24 =
70 ÷ 5 - 8 =
150 ÷ 5 - 6 =
72 + 80 - 50 =
120 - 37 - 63 =
120 - 45 × 2 =
100 - 100 ÷ 4 =
50 - 50 ÷ 5 =
18 × 9 + 18 =
48 ÷ 4 × 25 =
350 ÷ 7 × 4 =
8 × 207 + 8 =
6 × 300 + 4 =
150 ÷ 25 - 6 =