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$0.15×40×20=$
$2.4×0.4×3=$
$1.4×0.06×3=$
$0.15×20×2=$
$0.15×40×20=$
120
$0.25×40×2=$20
$2.6×40×30=$3120
$2.4×0.4×3=$
2.88
$1.6×0.05×4=$0.32
$13×0.08×2=$2.08
$1.4×0.06×3=$
0.252
$2.8×0.02×0.5=$0.028
$0.35×0.5×2=$0.35
$0.15×20×2=$
6
$0.55×300×4=$660
$0.45×0.3×2=$0.27
答案
1. $0.15×40×20$
$0.15×40 = 6$
$6×20 = 120$
结论：120
2. $0.25×40×2$
$0.25×40 = 10$
$10×2 = 20$
结论：20
3. $2.6×40×30$
$2.6×40 = 104$
$104×30 = 3120$
结论：3120
4. $2.4×0.4×3$
$2.4×0.4 = 0.96$
$0.96×3 = 2.88$
结论：2.88
5. $1.6×0.05×4$
$1.6×0.05 = 0.08$
$0.08×4 = 0.32$
结论：0.32
6. $13×0.08×2$
$13×0.08 = 1.04$
$1.04×2 = 2.08$
结论：2.08
7. $1.4×0.06×3$
$1.4×0.06 = 0.084$
$0.084×3 = 0.252$
结论：0.252
8. $2.8×0.02×0.5$
$0.02×0.5 = 0.01$
$2.8×0.01 = 0.028$
结论：0.028
9. $0.35×0.5×2$
$0.5×2 = 1$
$0.35×1 = 0.35$
结论：0.35
10. $0.15×20×2$
$20×2 = 40$
$0.15×40 = 6$
结论：6
11. $0.55×300×4$
$300×4 = 1200$
$0.55×1200 = 660$
结论：660
12. $0.45×0.3×2$
$0.3×2 = 0.6$
$0.45×0.6 = 0.27$
结论：0.27
$0.15×40 = 6$
$6×20 = 120$
结论：120
2. $0.25×40×2$
$0.25×40 = 10$
$10×2 = 20$
结论：20
3. $2.6×40×30$
$2.6×40 = 104$
$104×30 = 3120$
结论：3120
4. $2.4×0.4×3$
$2.4×0.4 = 0.96$
$0.96×3 = 2.88$
结论：2.88
5. $1.6×0.05×4$
$1.6×0.05 = 0.08$
$0.08×4 = 0.32$
结论：0.32
6. $13×0.08×2$
$13×0.08 = 1.04$
$1.04×2 = 2.08$
结论：2.08
7. $1.4×0.06×3$
$1.4×0.06 = 0.084$
$0.084×3 = 0.252$
结论：0.252
8. $2.8×0.02×0.5$
$0.02×0.5 = 0.01$
$2.8×0.01 = 0.028$
结论：0.028
9. $0.35×0.5×2$
$0.5×2 = 1$
$0.35×1 = 0.35$
结论：0.35
10. $0.15×20×2$
$20×2 = 40$
$0.15×40 = 6$
结论：6
11. $0.55×300×4$
$300×4 = 1200$
$0.55×1200 = 660$
结论：660
12. $0.45×0.3×2$
$0.3×2 = 0.6$
$0.45×0.6 = 0.27$
结论：0.27
乘风破浪
$0.4×25+40=$
$7+1.4×0.5=$
$10-3.6-4.4=$
$0.15×8×2=$
$0.4×5×10=$
$2.5×4×0.3=$
$0.4×25+40=$
50
$2.5×4-5=$5
$1.25×8+10.8=$20.8
$7+1.4×0.5=$
7.7
$89-0.45×2=$88.1
$(8+0.8)×1.25=$11
$10-3.6-4.4=$
2
$0.125×8×56=$56
$0.25×4+1.25×8=$11
$0.15×8×2=$
2.4
$9×2.6+1×2.6=$26
$7.8×4+1.2×4=$36
$0.4×5×10=$
20
$10×1.2×4=$48
$5.7×5-0.7×5=$25
$2.5×4×0.3=$
3
$0.5×15×20=$150
$0.8×12.5×0.9=$9
答案
1. $0.4×25 + 40$
= $10 + 40$
= $50$
2. $2.5×4 - 5$
= $10 - 5$
= $5$
3. $1.25×8 + 10.8$
= $10 + 10.8$
= $20.8$
4. $7 + 1.4×0.5$
= $7 + 0.7$
= $7.7$
5. $89 - 0.45×2$
= $89 - 0.9$
= $88.1$
6. $(8 + 0.8)×1.25$
= $8×1.25 + 0.8×1.25$
= $10 + 1$
= $11$
7. $10 - 3.6 - 4.4$
= $10 - (3.6 + 4.4)$
= $10 - 8$
= $2$
8. $0.125×8×56$
= $1×56$
= $56$
9. $0.25×4 + 1.25×8$
= $1 + 10$
= $11$
10. $0.15×8×2$
= $0.15×(8×2)$
= $0.15×16$
= $2.4$
11. $9×2.6 + 1×2.6$
= $(9 + 1)×2.6$
= $10×2.6$
= $26$
12. $7.8×4 + 1.2×4$
= $(7.8 + 1.2)×4$
= $9×4$
= $36$
13. $0.4×5×10$
= $2×10$
= $20$
14. $10×1.2×4$
= $12×4$
= $48$
15. $5.7×5 - 0.7×5$
= $(5.7 - 0.7)×5$
= $5×5$
= $25$
16. $2.5×4×0.3$
= $10×0.3$
= $3$
17. $0.5×15×20$
= $0.5×20×15$
= $10×15$
= $150$
18. $0.8×12.5×0.9$
= $10×0.9$
= $9$
= $10 + 40$
= $50$
2. $2.5×4 - 5$
= $10 - 5$
= $5$
3. $1.25×8 + 10.8$
= $10 + 10.8$
= $20.8$
4. $7 + 1.4×0.5$
= $7 + 0.7$
= $7.7$
5. $89 - 0.45×2$
= $89 - 0.9$
= $88.1$
6. $(8 + 0.8)×1.25$
= $8×1.25 + 0.8×1.25$
= $10 + 1$
= $11$
7. $10 - 3.6 - 4.4$
= $10 - (3.6 + 4.4)$
= $10 - 8$
= $2$
8. $0.125×8×56$
= $1×56$
= $56$
9. $0.25×4 + 1.25×8$
= $1 + 10$
= $11$
10. $0.15×8×2$
= $0.15×(8×2)$
= $0.15×16$
= $2.4$
11. $9×2.6 + 1×2.6$
= $(9 + 1)×2.6$
= $10×2.6$
= $26$
12. $7.8×4 + 1.2×4$
= $(7.8 + 1.2)×4$
= $9×4$
= $36$
13. $0.4×5×10$
= $2×10$
= $20$
14. $10×1.2×4$
= $12×4$
= $48$
15. $5.7×5 - 0.7×5$
= $(5.7 - 0.7)×5$
= $5×5$
= $25$
16. $2.5×4×0.3$
= $10×0.3$
= $3$
17. $0.5×15×20$
= $0.5×20×15$
= $10×15$
= $150$
18. $0.8×12.5×0.9$
= $10×0.9$
= $9$
圆满返航
右图是由7个相同的小正方体搭成的立体图形，淘气把这个立体图形的表面涂成了红色。请你想一想：三面涂成红色的小正方体有(
秘籍点拨 可以从不同方向观察立体图形进行想象，也可以搭一个这样的立体图形进行观察。
★评价：需要努力() 基本过关() 非常出色()
第48片
右图是由7个相同的小正方体搭成的立体图形，淘气把这个立体图形的表面涂成了红色。请你想一想：三面涂成红色的小正方体有(
1
)个，四面涂成红色的小正方体有(4
)个，五面涂成红色的小正方体有(1
)个。秘籍点拨 可以从不同方向观察立体图形进行想象，也可以搭一个这样的立体图形进行观察。
★评价：需要努力() 基本过关() 非常出色()
第48片
答案
三面涂成红色的小正方体有(1)个，四面涂成红色的小正方体有(4)个，五面涂成红色的小正方体有(1)个。
