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a) (370 + 12) : 2 = 382 : 2
= 191
370 + 12 : 2 = 370 + 6
= 376
b) (231 – 100) x 2 = 131 x 2
= 262
231 – 100 x 2 = 231 – 200
= 31
c) 14 x 6 : 2 = 84 : 2
= 42
14 x (6 : 2) = 14 x 3
= 42
d) 900 – 200 – 100 = 700 – 100
= 600
900 – (200 – 100) = 900 – 100
= 800
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100 x 100 + ( 100 + 100 x 2 )
10000 + (100+200)
10000+300
=10300
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756 = 700 + 50 + 6 hoặc 7 x 100 + 5 x 10 + 6 x 1
862 = 8 x 100 + 6 x 10 + 2
HT
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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
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`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`
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100 + 100 + 100 + 100 x 12 x 12 = ?
= 100 x 4 x 12 x 12
= 400 x 144
= 57600
100 + 100 + 100 + 100 x 12 x12
= 100 x 4 x12x12
= 400 x 144
= 57600
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 100 = 100 + 100 x 2 + 400
x + 100 = 100 + 200 + 400
x + 100 = 700
x = 700 - 100
x = 600
Vậy x = 600
x+100=100+100x2 +400
x+100=100+200+400
x+100= 300+400
x+100=700
x =700-100
x =600
Vay x = 600
\(\left(100+100+100+100+100+100\right):6\times2\)
\(=600:6\times2\)
\(=100\times2\)
\(=200\)
(100 + 100 + 100 + 100 + 100 + 100) : 6 x 2
= 100 x 6 : 6 x 2
= 600 : 6 x 2
= 100 x 2
= 200