人教版小学五年级数学上册复习简便运算 课件
文档属性
| 名称 | 人教版小学五年级数学上册复习简便运算 课件 |  | |
| 格式 | zip | ||
| 文件大小 | 297.0KB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 人教版（新课程标准） | ||
| 科目 | 数学 | ||
| 更新时间 | 2017-07-27 10:06:01 | ||
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文档简介
课件19张PPT。人教版五年级上册复习简便运算=125×0.8×1.3
=(125×0.8)×1.3
=100 ×1.3
=130125×1.3×0.8
=0.25×1.2×0.9
=0.25×(4×0.3)×0.9
=(0.25×4)×0.3×0.9
=1×0.3×0.9
=0.270.25×0.9×1.2=(200-1)×0.88
=200×0.88-1×0.88
=176-0.88
=175.12199×0.8890×10.3= 90 ×（10+0.3）
=90×10+90×0.3
=900+27
=9272.37×15-2.37×5=2.37×（15-5）
=2.37×10
=23.79.7＋9.7×99= 9.7×1+9.7×99
=9.7×（1+99）
=9.7×100
=97010.9×6+109×0.4=109×0.6+109×0.4
=109×（0.6+0.4）
=109×1
=109www.xkb1.com50.5÷2.5÷0.2=50.5÷（2.5×0.2）
=50.5÷5
=10.1括号前面是除号，去掉括号要变号，乘号变除号，除号变乘号
2.4÷（3.6÷5）=2.4÷3.6×5
=2.4×5÷3.6
=12÷3.6
=214.68-7.82-2.18=14.68-（7.82+2.18）
=14.68-10
=4.688.75+3.37-0.75+4.63= 8.75-0.75+3.37+4.63
=(8.75-0.75)+(3.37+4.63)
=8+8
=16没有括号的同一级运算可以换位置www.xkb1.com13.75-（6.38+3.75）=13.75-6.38-3.75
=(13.75-3.75)-6.38
=10-6.38
=3.6226.06-（9.06-5.6）=26.06-9.06+5.6
=(26.06-9.06)+5.6
=17+5.6
=22.6特殊括号前面是减号，去掉括号要变号，加号变减号，减号变加号 5.32-2.16-0.84
=5.32-(2.16+0.84)
=5.32-3
=2.32 14.4÷2.4÷3
=14.4÷(2.4×3)
=14.4÷7.2
=2 12.3×19-123×0.9
=123×1.9-123×0.9
=123×（1.9-0.9）
=123×1
=1230.25×36
=0.25×4×9
=1×9
=9www.xkb1.com 2.5×16×0.7
=2.5×(4×4)×0.7
=(2.5×4)×(4×0.7)
=10 ×2.8
=28 6.3×302
=6.3×(300+2)
=6.3×300+6.3×2
=1890+12.6
=1902.6
1.26×8+8×1.74
= (1.26+1.74) ×8
=3×8
= 24
1.25×1.19×1.6
=1.25×1.19×(8×0.2)
=1.25×(8×0.2)×1.19
=(1.25×8)×(0.2×1.19)
=10×0.238
=2.38 1.25×2.5×32320÷1.25÷817.8÷(1.78×4)2.22×9.9＋6.66×6.7=1.25×2.5×(4×8)
=(1.25×8)×(2.5×4)
=10×10
=100=320÷(1.25×8)
=320÷10
=32=17.8÷1.78÷4
=1÷4
=0.25=2.22×(3×3.3)+6.66×6.7
=(2.22×3) ×3.3+6.66×6.7
=6.66×3.3+6.66×6.7
=6.66×(3.3+6.7)
=6.66×10
=66.64.8×7.8＋78×0.5215.6×13.1－15.6－15.6×2.1(1.25－0.125)×84.8－4.8×0.5=1.25×8-0.125×8
=10-1
=9=4.8×7.8+7.8×5.2
=7.8×(4.8+5.2)
=7.8×10
=78=15.6×13.1-15.6×1-15.6×2.1
=15.6×(13.1-1-2.1)
=15.6×10
=156=4.8×1-4.8×0.5
=4.8×(1-0.5)
=4.8×0.5
=2.46.1-5.9 +3.9- 4.115.89+（6.75-5.89）31.2-（21.2-8.8）25.8-13.6-5.8-6.4
=(125×0.8)×1.3
=100 ×1.3
=130125×1.3×0.8
=0.25×1.2×0.9
=0.25×(4×0.3)×0.9
=(0.25×4)×0.3×0.9
=1×0.3×0.9
=0.270.25×0.9×1.2=(200-1)×0.88
=200×0.88-1×0.88
=176-0.88
=175.12199×0.8890×10.3= 90 ×（10+0.3）
=90×10+90×0.3
=900+27
=9272.37×15-2.37×5=2.37×（15-5）
=2.37×10
=23.79.7＋9.7×99= 9.7×1+9.7×99
=9.7×（1+99）
=9.7×100
=97010.9×6+109×0.4=109×0.6+109×0.4
=109×（0.6+0.4）
=109×1
=109www.xkb1.com50.5÷2.5÷0.2=50.5÷（2.5×0.2）
=50.5÷5
=10.1括号前面是除号，去掉括号要变号，乘号变除号，除号变乘号
2.4÷（3.6÷5）=2.4÷3.6×5
=2.4×5÷3.6
=12÷3.6
=214.68-7.82-2.18=14.68-（7.82+2.18）
=14.68-10
=4.688.75+3.37-0.75+4.63= 8.75-0.75+3.37+4.63
=(8.75-0.75)+(3.37+4.63)
=8+8
=16没有括号的同一级运算可以换位置www.xkb1.com13.75-（6.38+3.75）=13.75-6.38-3.75
=(13.75-3.75)-6.38
=10-6.38
=3.6226.06-（9.06-5.6）=26.06-9.06+5.6
=(26.06-9.06)+5.6
=17+5.6
=22.6特殊括号前面是减号，去掉括号要变号，加号变减号，减号变加号 5.32-2.16-0.84
=5.32-(2.16+0.84)
=5.32-3
=2.32 14.4÷2.4÷3
=14.4÷(2.4×3)
=14.4÷7.2
=2 12.3×19-123×0.9
=123×1.9-123×0.9
=123×（1.9-0.9）
=123×1
=1230.25×36
=0.25×4×9
=1×9
=9www.xkb1.com 2.5×16×0.7
=2.5×(4×4)×0.7
=(2.5×4)×(4×0.7)
=10 ×2.8
=28 6.3×302
=6.3×(300+2)
=6.3×300+6.3×2
=1890+12.6
=1902.6
1.26×8+8×1.74
= (1.26+1.74) ×8
=3×8
= 24
1.25×1.19×1.6
=1.25×1.19×(8×0.2)
=1.25×(8×0.2)×1.19
=(1.25×8)×(0.2×1.19)
=10×0.238
=2.38 1.25×2.5×32320÷1.25÷817.8÷(1.78×4)2.22×9.9＋6.66×6.7=1.25×2.5×(4×8)
=(1.25×8)×(2.5×4)
=10×10
=100=320÷(1.25×8)
=320÷10
=32=17.8÷1.78÷4
=1÷4
=0.25=2.22×(3×3.3)+6.66×6.7
=(2.22×3) ×3.3+6.66×6.7
=6.66×3.3+6.66×6.7
=6.66×(3.3+6.7)
=6.66×10
=66.64.8×7.8＋78×0.5215.6×13.1－15.6－15.6×2.1(1.25－0.125)×84.8－4.8×0.5=1.25×8-0.125×8
=10-1
=9=4.8×7.8+7.8×5.2
=7.8×(4.8+5.2)
=7.8×10
=78=15.6×13.1-15.6×1-15.6×2.1
=15.6×(13.1-1-2.1)
=15.6×10
=156=4.8×1-4.8×0.5
=4.8×(1-0.5)
=4.8×0.5
=2.46.1-5.9 +3.9- 4.115.89+（6.75-5.89）31.2-（21.2-8.8）25.8-13.6-5.8-6.4