Tìm X : 9450 : x = 148 + 122
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(36 × 27) : 3 = 36 × (27 : 3)
= 36 × 9
= 324
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(125 × 15) : 5
= 125 × (15 : 5)
= 125 × 3
= 375
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(15 × 12) : 9
= (5 × 3 × 12) : 9
= 5 × (36 : 9)
= 5 × 4
= 20
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450 : (3 × 5)
= 450 : 15
= 30
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(45 × 63) : 9
= 45 × (63 : 9)
= 45 × 7
= 40 × 7 + 5 × 7
= 280 + 35
= 315
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a, x < 148 x 4 : 184 = 4
b, x:5 = 1798 - 246 = 1552
x = 1552 x 5 = 7760
k mk nha
a, 148 x X < 148 x 4
Suy ra x < 4
Suy ra x = 1; 2; 3
b, X : 5 + 246 = 1798
X : 5 = 1 798 - 246
X : 5 = 1552
x = 1552 x 5
x = 7760
P/s tham khao nha
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112+114+116+118+120+122+124+126+148+130=1230
chúc bn hok giỏi
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x x 5 + 122 + 236 = 633
(x x 5 ) + 122 + 236 = 633
(x x 5 ) + 358 = 633
(x x 5 ) = 633 -358
x x 5 = 275
x = 275 : 5
x = 55
(x x 5 ) + 122 + 236 = 633
(x x 5 ) = 633 -358
x = 275 : 5
x = 55
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Đáp án là B
Ta có:
- 12 2 .x = 56 + 10.13x
144x = 56 + 130x
144x - 130x = 56
14x = 56
x = 4
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\(...\Rightarrow x+x+\dfrac{x}{43}+\dfrac{x}{8}=14+148+\dfrac{10}{30}+\dfrac{5}{95}\)
\(\Rightarrow\left(1+1+\dfrac{1}{43}+\dfrac{1}{8}\right)x=162+\dfrac{1}{3}+\dfrac{1}{19}\)
\(\Rightarrow\left(\dfrac{2.43.8}{43.8}+\dfrac{1.8}{43.8}+\dfrac{1.43}{43.8}\right)x=\dfrac{162.3.19}{3.19}+\dfrac{1.19}{3.19}+\dfrac{1.3}{19.3}\)
\(\Rightarrow\left(\dfrac{688}{344}+\dfrac{8}{344}+\dfrac{43}{344}\right)x=\dfrac{9234}{57}+\dfrac{19}{57}+\dfrac{3}{57}\)
\(\Rightarrow\dfrac{739}{344}x=\dfrac{9256}{57}\)
\(\Rightarrow x=\dfrac{9256}{57}:\dfrac{739}{344}=\dfrac{9256}{57}.\dfrac{344}{739}=\dfrac{\text{3184064}}{\text{42123}}\)
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9450 : x = 148 + 122
9450: x = 270
x = 9450 : 270
x = 35
HT
9450 : x = 148 + 122
9450: x = 270
x = 9450 : 270
x = 35