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100 x 3 + 400 ... 100 + 200 + 100 x 4
= 100 x 3 + 400 = 700
= 100 + 200 + 100 x 4 = 700
=> 100 x 3 + 400 = 100 + 200 + 100 x 4
![](https://rs.olm.vn/images/avt/0.png?1311)
b) 200 x 4 = .800..... 300 x 2 = ..600....
200 x 2 = .400..... 300 x 3 = ...900...
400 x 2 = ...800... 500 x 1 = ..500....
100 x 4 = ..400.... 100 x 3 = .300.....
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
100 x 3 + 100 x 6 + 100
=100 x(3+6+1)
=100 x 10
=1000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 x 2 = 4 3 x 3 = 9
2 x 4 = 8 3 x 5 = 15
2 x 6 = 12 3 x 7 = 21
2 x 8 = 16 3 x 9 = 27
4 x 4 = 16 5 x 5 = 25
4 x 2 = 8 5 x 7 = 35
4 x 6 = 24 5 x 9 = 45
4 x 8 = 32 5 x 3 = 15
b) 200 x 4 = 800 300 x 2 = 600
200 x 2 = 400 300 x 3 = 900
400 x 2 = 800 500 x 1 = 500
100 x 4 = 400 100 x 3 = 300
![](https://rs.olm.vn/images/avt/0.png?1311)
x+700=900-100
x+700=800
x = 800-700
x = 100
x+300=400+500
x+300=900
x = 900-300
x = 600
x+100=900+300
x+100= 1200
x = 1200 - 100
x = 1100
x+700=900-100
x+700=800
x =800-700
x =100
x+300=400+500
x+300=900
x =900-300
x =600
x+100=900+300
x+100=1200
x =1200-100
x =1100
![](https://rs.olm.vn/images/avt/0.png?1311)
`a,`
`13 \times 100 + 2 \times 100 - 9 \times 100`
`= 100 \times (13+2-9)`
`= 100 \times 6`
`= 600`
`b,`
`10 - 8 + 9 - 7 + 6 - 4 + 5 - 3 +2 - 0`
`= (10-8)+(9-7)+(6-4)+(5-3)+2`
`= 2+2+2+2+2`
`= 10`
![](https://rs.olm.vn/images/avt/0.png?1311)
(x+1)+(x+2)+...+(x+100)=5750
(x+x+...+x)+(1+2+3+...+100)=5750
100x+5050=5750
100x=5750-5050
100x=700
x=700/100
x=7
![](https://rs.olm.vn/images/avt/0.png?1311)
10 x 45 - 25 x 10
= 10 x ( 45 - 25 )
= 10 x 20
= 200
100 x 2 + 100 x 3
= 100 x ( 2 + 3 )
= 100 x 5
= 500
10 x 45 - 25 x 10
= 10 x [45 - 25]
= 10 x 20
= 200
100 x 2 + 100 x 3
= 100 x [2 + 3]
= 100 x 5
= 500
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 :
a) = 98765
b) = 300657
c) 610000
Bài 2:
a) X + 77 = 1800
X = 1800 - 77
X = 1723
b) 8950 : x = 5
x = 8950 : 5
x = 1790
c) x = 8765 : 5
x = 1753
a,98765 b,300657 c,610000 Bài 2 : a, 17923 b, 1790 c, 1753
Tích bằng :
100 x 3 = 300
Đáp số : 300
100 x 3 = 300
tk em nha em tk lại chị