扬帆起航
$136 - 87 =$ $5600 ÷ 56 =$ $300 × 24 =$
$750 - 360 =$ $2400 ÷ 800 =$ $25 × 16 =$
$87 ÷ 100 =$ $9.82 + 0.08 =$ $0.78 × 10 =$
$35 ÷ 10 =$ $27 ÷ 1000 =$ $0.56 + 0.4 =$

1. $136 - 87 = 49$
2. $5600 ÷ 56 = 100$
3. $300 × 24 = 7200$
4. $750 - 360 = 390$
5. $2400 ÷ 800 = 3$
6. $25 × 16 = 400$
7. $87 ÷ 100 = 0.87$
8. $9.82 + 0.08 = 9.90$
9. $0.78 × 10 = 7.8$
10. $35 ÷ 10 = 3.5$
11. $27 ÷ 1000 = 0.027$
12. $0.56 + 0.4 = 0.96$

乘风破浪
$80 + 25 =$ $1 - 0.97 =$ $1000 ÷ 25 =$
$90 - 0.9 =$ $726 ÷ 6 =$ $13 × 70 =$
$840 ÷ 40 =$ $3.4 + 5.6 =$ $9 ÷ 100 =$
$0.138 × 100 =$ $6.28 + 7.12 =$ $8.4 ÷ 10 =$
$2.5 × 20 =$ $81.04 ÷ 100 =$ $600 ÷ 15 =$
$0.6 × 1000 =$ $13 × 50 =$ $4500 ÷ 900 =$
$325 + 298 =$ $32 + 468 =$ $3 - 0.64 =$
$0.43 + 8.5 =$ $50 × 6 =$ $6.3 - 0.01 =$
$12.5 × 8 =$ $0.25 × 40 =$ $0.01 × 79 =$

$80 + 25 = 105$；
$1 - 0.97 = 0.03$；
$1000 ÷ 25 = 40$；
$90 - 0.9 = 89.1$；
$726 ÷ 6 = 121$；
$13 × 70 = 910$；
$840 ÷ 40 = 21$；
$3.4 + 5.6 = 9$；
$9 ÷ 100 = 0.09$；
$0.138 × 100 = 13.8$；
$6.28 + 7.12 = 13.4$；
$8.4 ÷ 10 = 0.84$；
$2.5 × 20 = 50$；
$81.04 ÷ 100 = 0.8104$；
$600 ÷ 15 = 40$；
$0.6 × 1000 = 600$；
$13 × 50 = 650$；
$4500 ÷ 900 = 5$；
$325 + 298 = 623$；
$32 + 468 = 500$；
$3 - 0.64 = 2.36$；
$0.43 + 8.5 = 8.93$；
$50 × 6 = 300$；
$6.3 - 0.01 = 6.29$；
$12.5 × 8 = 100$；
$0.25 × 40 = 10$；
$0.01 × 79 = 0.79$。

圆满返航
淘气每分钟做$x$道口算，笑笑每分钟做$y$道口算，淘气做得快。
$x - y$表示
$5(x + y)$表示
秘籍点拨 读懂$x$与$y$的意思，再想式子所表示的意思。
第71片

$x - y$表示淘气每分钟比笑笑多做的口算题数。
$5(x + y)$表示淘气和笑笑两人5分钟总共做的口算题数。