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x : 54 + x : 16 = 217
x : ( 54 + 16 ) = 217
x : 70 = 217
x = 217 x 70
x = 15190
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x+1000-200=2000
x+1000=2200
x=2200-1000
x=1200
70-5.(x-3)=45
5.(x-3)=70-45
5.(x-3)=25
x-3=5
x=8
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a 81: x = 27: 3
81 : x = 9
x = 81 : 9
x = 9
b 75 : x = 45 : 5
75 : x = 9
x = 75 : 9
x = 8 dư 3
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1 + 1 = 2
5 x 3 = 15
7 x 4 = 28
65 + 45 = 110
9 x 54 = 486
1 + 1 = 2
5 x 3 = 15
7 x 4 = 28
65 + 45 = 110
9 x 54 = 486
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9 x 2 = 18 | 9 x 3 = 27 | 9 x 4 = 36 | 9 x 5 = 45 |
18 : 9 = 2 | 27 : 9 = 3 | 36 : 9 = 4 | 45 : 9 = 5 |
9 x 6 = 54 | 9 x 7 = 63 | 9 x 8 = 72 | 9 x 9 = 81 |
54 : 9 = 6 | 63 : 9 = 7 | 72 : 9 = 8 | 81 : 9 = 9 |
9 x 2 = 18 9 x 3 = 27 9 x 4 = 36 9 x 5 = 45
18 : 9 = 2 27 : 9 = 3 36 : 9 = 4 45 : 9 = 5
9 x 6 = 54 9 x 7 = 63 9 x 8 = 72 9 x 9 = 81
54 : 9 = 6 63 : 9 = 7 72 : 9 = 8 81 : 9 = 9
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1) Tính:
34 x 2= 68; 46 x 6=276; 56 x 5= 280; 11 x 5= 55; 47 x 5= 235; 45 x 5= 225; 77 x 6= 462; 90 x 5= 450; 12 x 6= 72; 11x4=44; 23x4=92; 45 x 6= 270.
2) Tìm x:
34 x X = 102
=> X = 102 - 34
=> X = 68
3) Tính;
45 : 6 = 7 ( dư 3)
34 : 5 = 6 ( dư 4)
45 : 5 = 9
54 : 6 = 9
4) .....
a) các số là: 12,14,16,18,10;22,24,26,28,20;32,34,36,68,30;42,44,46,48,49,40;52,54,56,58,50;62,64,66,68,60;72,74,76,78,70;82,84,86,88,80;92,94,96,98,90.
b) có tất cả 40 số.
bài 1
34x2=68
46x6=276
56x5=280
11x5=55
47x5=235
45x5=225
77x6=462
90x5=450
99x5=495
12x6=72
11x4=44
23x4=92
45x6=270
Bài 2
34 x X = 102
X = 102 : 34
X = 3
Bài 3
45:6=7(dư 3)
34:5=6(dư 4)
45:5=9
54:6=9
Bài 4
45
k nha,bài 4 mình ko chắc lắm
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70 - 5 . ( x - 3) = 45
5 . ( x - 3 ) = 70 - 45
5 . ( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
\(70-5.\left(x-3\right)=45\)
\(5.\left(x-3\right)=70-45\)
\(5.\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
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a) (235 - x ) - 81 = 54 b) 124 : (118 - x) =217
235 - x = 54 + 81 118 - x = 217 - 124
X= 235 - x = 135 118 - x = 93
X= 235 - 135 X= 118 - 83
X= 100 X= 25
c) 70 - 5 (x - 3) = 45 d) 4221 : (x - 16) = 21
5 (x - 3) = 70 - 45 x - 16 = 4221 : 21
5 (x - 3) = 25 x - 16 = 201
x - 3 = 25 : 5 X= 201 : 16
x - 3 = 5 X= 217
X= 5 + 3
X= 8
1+1+8+3+5+7+9+1