扬帆起航
$6 × 1.4 × 10 =$ $0.25 × 30 × 15 =$ $0.15 × 30 =$
$0.05 × 98 =$ $0.26 × 0.05 =$ $250 × 0.08 =$
$0.6 × 0.15 =$ $2.5 × 0.04 =$ $0.36 × 0.4 =$
$0.55 × 0.4 =$ $0.15 × 0.08 =$ $0.4 × 0.78 =$

$6×1.4×10$
$=8.4×10$
$=84$
$0.25×30×15$
$=7.5×15$
$=112.5$
$0.15×30=4.5$
$0.05×98=4.9$
$0.26×0.05=0.013$
$250×0.08=20$
$0.6×0.15=0.09$
$2.5×0.04=0.1$
$0.36×0.4=0.144$
$0.55×0.4=0.22$
$0.15×0.08=0.012$
$0.4×0.78=0.312$

乘风破浪
$2.5 × 40 =$ $2.5 × 800 =$ $1.25 × 8 =$
$87.6 ÷ 1000 =$ $9.9 ÷ 100 =$ $0.19 × 1000 =$
$6.78 ÷ 1000 =$ $0.15 × 1000 =$ $0.82 × 100 =$
$4.89 × 100 =$ $7.80 ÷ 100 =$ $3.2 × 100 =$
$0.15 × 100 =$ $46 ÷ 1000 =$ $0.35 × 100 =$
$8.5 × 100 =$ $9.5 ÷ 100 =$ $4.8 × 100 =$
$3.5 × 0.4 + 13 =$ $3.6 × 4 - 1.8 =$ $2.5 × 20 + 2.5 =$
$1.9 × 25 - 10 =$ $8 × 2.25 + 19 =$ $0.55 × 4 + 2.8 =$

$2.5 × 40 = 100$；
$2.5 × 800 = 2000$；
$1.25 × 8 = 10$；
$87.6 ÷ 1000 = 0.0876$；
$9.9 ÷ 100 = 0.099$；
$0.19 × 1000 = 190$；
$6.78 ÷ 1000 = 0.00678$；
$0.15 × 1000 = 150$；
$0.82 × 100 = 82$；
$4.89 × 100 = 489$；
$7.80 ÷ 100 = 0.078$；
$3.2 × 100 = 320$；
$0.15 × 100 = 15$；
$46 ÷ 1000 = 0.046$；
$0.35 × 100 = 35$；
$8.5 × 100 = 850$；
$9.5 ÷ 100 = 0.095$；
$4.8 × 100 = 480$；
$3.5 × 0.4 + 13 =14.4$；
$3.6 × 4 - 1.8 = 12.6$；
$2.5 × 20 + 2.5 = 52.5$；
$1.9 × 25 - 10 = 37.5$；
$8 × 2.25 + 19 = 37$；
$0.55 × 4 + 2.8 = 5$。

圆满返航
先找等量关系，再列出方程。

秘籍点拨 根据图意，先找等量关系，再列出方程。
第54片

等量关系：恐龙玩具的价格×2 - 45元 = 赛车玩具的价格
方程：2x - 45 = 111