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a) 156 - 2 . x = 80
2 . x = 156 - 80
2 . x = 76
x= 76 : 2
x = 38
b) 315 + 5 . x = 200
5 . x = 200 - 315
5 . x = -115
x= -115 : 5
x = -23
c) 5 . ( x + 3 ) - 20 = 40
5 . ( x +3) = 40+20
5. ( x + 3) =60
x +3 =60:5
x + 3= 12
x = 12 - 3
x =9
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a) \(x:\frac{2}{3}=150\)
\(x=150.\frac{2}{3}\)
\(x=100\)
b) \(\frac{35}{9}:x=\frac{35}{6}\)
\(x=\frac{35}{9}.\frac{6}{35}=\frac{2}{3}\)
c,d tương tự
a ) x : 2/3 = 150 c ) x : 4/7 = 180
x = 150 x 2/3 x = 180 x 4/7
x = 100 x = 720/7
b ) 35/9 : x = 35/6 d ) 49/8 : x = 49/5
x = 35/9 : 35/6 x = 49/8 : 49/5
x = 2/3 x = 5/8
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=> x . 5 = 180 + 40 = 220
=> x = 220 : 5 = 44
tick đúng cho mình nhé !
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Vế trái có tất cả (180 - 6)/3 + 1 = 59 số hạng trong ngoặc.
(x + x + ... + x) + ( 6 + 9 + .. + 180) = 6372
59.x + 3.(2 + 3 + .. + 60) = 6372
Tính riêng 2 + 3 + .. + 60 ta có:
2 + 3 + .. + 60
= (1 + 2 + 3 + .. + 60) - 1 (thêm 1 và bớt 1 thì tổng không đổi)
= (1 + 60) + (2+59) + .. + (30 + 31) - 1
= 61 + 61 + .. + 61 -1
= 61 x 30 - 1
= 1829
Thay vào phương trình:
59 . x + 3 . 1829 = 6372
59 . x + 5487 = 6372
59 . x = 6372 - 5487
59 . x = 885
x = 885 : 59
x = 15
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x:2.8-x:3.9-x=180
x:(2.8-3.9-1)=180
x:(-10)=180
x =180:(-10)
x = -18
vậy x=-18
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a/ \(\frac{x}{2}+\frac{x}{3}+\frac{x}{4}=180\)
\(\Leftrightarrow x\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)=180\)
\(\Leftrightarrow\frac{13}{12}x=180\)
\(\Leftrightarrow x=\frac{2160}{13}\)
b/ \(\frac{1}{x.2}+\frac{2}{x.3}+\frac{3}{x.4}=120\)
\(\Leftrightarrow\frac{1}{x}\left(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}\right)=120\)
\(\Leftrightarrow\frac{1}{x}.\frac{23}{12}=120\)
\(\Leftrightarrow\frac{1}{x}=\frac{1440}{23}\)
\(\Leftrightarrow x=\frac{23}{1440}\)
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15 x 360 + 40 x 61 x 9 + 180 x 62 - 210 x 12
= 15 x 360 + (40 x 9) x 61 + 180 x 62 - 180 x \(\frac{7}{6}\) x 12
= 15 x 360 + 360 x 61 + 180 x 62 - 180 x 14
= (15 + 61) x 360 + 180 x (62 - 14)
= 76 x 360 + 180 x 48
= 76 x 2 x 180 + 180 x 48
= 152 x 180 + 180 x 48
= (152 + 48) x 180
= 200 x 180
= 36000
15 x 360 + 40 x 61 x 9 + 180 x 62 - 210 x 12
= 5400 + 40 x 61 x 9 + 180 x 62 - 210 x 12
= 5400 + 21960 - 2520
= 27360 - 2520
= 24840
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