Câu 9 <,>,= a) 67.....66 b) 78-0...... 80-4 c) 56......56
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a) 12 + 23 + 34 + 45 + 56 + 67 + 78 + 89
= ( 12 + 78 ) + ( 23 + 67 ) + ( 34 + 56 ) + ( 45 + 89 )
= 90 + 90 + 90 + 132
= 90 x 3 + 132
= 270 + 132
= 402
b) 125 x 6 x 7 x 8
= 750 x 7 x 8
= 5250 x 8
= 42000
c) ( 56 x 78 + 56 x 47 ) : 7
= 56 x ( 78 + 47 ) : 7
= 56 x 125 : 7
= 7000 : 7
= 1000
a) 12 + 23 + 34 + 45 + 56 + 67 + 78 + 89
= ( 12 + 78 ) + ( 23 + 67 ) + ( 34 + 56 ) + ( 45 + 89 )
= 90 + 90 + 90 + 132
= 90 x 3 + 132
= 270 + 132
= 402
b) 125 x 6 x 7 x 8
= 750 x 7 x 8
= 5250 x 8
= 42000
c) ( 56 x 78 + 56 x 47 ) : 7
= 56 x ( 78 + 47 ) : 7
= 56 x 125 : 7
= 7000 : 7
= 1000
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x + 34 = 56 - 6
x + 34 = 50
x = 50 - 34
x = 16
y + 56 = 78 + 4
y + 56 = 82
y = 82 - 56
y = 26
x + 32 = 345
x = 345 - 32
x = 313
y + 67 - 6 = 89 - 0
y + 67 - 6 = 89
y + 67 = 89 + 6
y + 67 = 95
y = 95 - 67
y = 28
x + 34 = 56 - 6
x + 34 = 50
x = 50 - 34
x = 16
y + 56 = 78 + 4
y + 56 = 82
y = 82 - 56
y = 26
x + 32 = 345
x = 345 - 32
x = 313
y + 67 - 6 = 89 - 0
y + 67 - 6 = 89
y + 67 = 89 + 6
y + 67 = 95
y = 95 - 67
y = 28
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12 + 34 + 56 + 78 + 123 + 99 + 322 + 199 = 1223
12 x 45 x 67 x 89 x 0 = 0
12 : 4 : 3 x 9 : 3 x 1259 = 3777
Tk nha
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14/67÷32/67
14/67×67/32
14/32
12/78+23/56
672/4368+1794/4368
2466/4368
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a. 678 - x = 56 + 79
678 - x = 135
x = 678 - 135
x = 543
b. Sai đề rùi bn ơi
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a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
![](https://rs.olm.vn/images/avt/0.png?1311)
a)128-(x+56)=15
x+56=128-15
x+56=113
x=113-56
x=57
b)45+(34-x)=67
34-x=67-45=22
x=34-22
x=12
a) \(67>66.\)
b) \(78-0>80-4.\)
c) \(56=56.\)
a) 67 > 66
b) 78 - 0 > 80 - 4
c)56 = 56