一、在$◯$里填“＞”“＜”或“=”。
$13+5 ◯ 19$
$14+4 ◯ 16-2$
$17-2 ◯ 12+7$
$12-2 ◯ 10$
$18-3 ◯ 12+3$
$14-10 ◯ 13-3$
$15+1 ◯ 14$
$16+2 ◯ 19-2$
$11+6 ◯ 14+5$
$16 ◯ 17-3$
$19-7 ◯ 10+3$
$9+10 ◯ 18-2$
$17 ◯ 18+1$
$19-10 ◯ 18-8$
$19-0 ◯ 18+1$
$13 ◯ 19-6$
$10+6 ◯ 13+4$
$13-2 ◯ 15-5$

1.＜ 2.＞ 3.＜ 4.= 5.= 6.＜ 7.＞ 8.＞ 9.＜ 10.＞ 11.＜ 12.＞ 13.＜ 14.＜ 15.= 16.= 17.＜ 18.＞

二、在$□$里填合适的数。
$□ - 1 = 18$
$□ - 3 = 14$
$4 + □ = 16 + 2$
$□ + 1 = 13$
$□ - 5 = 10$
$□ + 9 = 13 - 3$
$□ + 3 = 15$
$□ + 2 = 17$
$18 + □ - 2 = 17$
$17 - □ = 10$
$□ - 6 = 12$
$6 + 3 + □ = 19$
$2 + □ = 17$
$19 - □ = 9$
$7 + □ = 15 - 5$
$6 + □ = 19$
$7 + □ = 18$
$□ + 5 = 13 + 4$
$12 - □ = 12$
$□ + 4 = 14$
$4 + 6 + □ = 14$

1.19 2.17 3.14 4.12 5.15 6.1 7.12 8.15 9.1 10.7 11.18 12.10 13.15 14.10 15.3 16.13 17.11 18.12 19.0 20.10 21.4