七、复习与关联
1
选数填空

$□ - □ = 13$ $□ + □ = 69$ $□ + □ = 88$

$□ - □ = 39$ $□ - □ = 66$ $□ + □ = 50$
$73 - 30 =$ $95 - 90 =$ $90 - 60 =$
$76 - 7 =$ $34 - 3 =$ $74 - 6 =$
$46 - 30 =$ $29 - 20 =$ $83 - 10 =$
$58 + 9 =$ $9 + 16 =$ $31 + 13 =$
$69 + 4 =$ $18 + 3 =$ $53 + 20 =$
$41 - 7 =$ $37 - 30 =$ $52 - 12 =$
$24 + 60 =$ $29 + 30 =$ $45 + 50 =$
$50 + 15 =$ $23 + 70 =$ $60 + 26 =$
$25 + 20 =$ $53 - 12 =$ $66 - 58 =$
$47 + 14 =$ $63 + 10 =$ $51 - 15 =$
$92 - 9 =$ $35 + 5 =$ $70 - 33 =$
$34 + 14 =$ $56 - 40 =$ $98 - 97 =$

选数填空答案依次为：$53$，$40$；$39$，$30$；$48$，$40$；$69$，$30$；$80$，$14$；$23$，$27$；
其余计算题答案依次为：$43$，$5$，$30$，$69$，$31$，$68$，$16$，$9$，$73$，$67$，$25$，$44$，$73$，$21$，$73$，$34$，$7$，$40$，$84$，$59$，$95$，$65$，$93$，$86$，$45$，$41$，$8$，$61$，$73$，$36$，$83$，$40$，$37$，$48$，$16$，$1$。

1. 选数填空：
$□ - □ = 13$：从给定数字中，尝试相减得到 13，$53 - 40 = 13$。
$□ + □ = 69$：尝试相加得到 69，$39 + 30 = 69$。
$□ + □ = 88$：尝试相加得到 88，$48 + 40 = 88$。
$□ - □ = 39$：尝试相减得到 39，$69 - 30 = 39$。
$□ - □ = 66$：尝试相减得到 66，$80 - 14 = 66$。
$□ + □ = 50$：尝试相加得到 50，$23 + 27 = 50$。
2. 计算题直接得出结果：
$73 - 30 = 43$，$95 - 90 = 5$，$90 - 60 = 30$，
$76 - 7 = 69$，$34 - 3 = 31$，$74 - 6 = 68$，
$46 - 30 = 16$，$29 - 20 = 9$，$83 - 10 = 73$，
$58 + 9 = 67$，$9 + 16 = 25$，$31 + 13 = 44$，
$69 + 4 = 73$，$18 + 3 = 21$，$53 + 20 = 73$，
$41 - 7 = 34$，$37 - 30 = 7$，$52 - 12 = 40$，
$24 + 60 = 84$，$29 + 30 = 59$，$45 + 50 = 95$，
$50 + 15 = 65$，$23 + 70 = 93$，$60 + 26 = 86$，
$25 + 20 = 45$，$53 - 12 = 41$，$66 - 58 = 8$，
$47 + 14 = 61$，$63 + 10 = 73$，$51 - 15 = 36$，
$92 - 9 = 83$，$35 + 5 = 40$，$70 - 33 = 37$，
$34 + 14 = 48$，$56 - 40 = 16$，$98 - 97 = 1$。