Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) (x - 15) × 7 - 270 : 45 = 169
(x - 15) × 7 - 6 = 169
(x - 15) × 7 = 169 + 6
(x - 15) × 7 = 175
x - 15 = 175 : 7
x - 15 = 25
x = 25 + 15
x = 40
b) [(4x + 28) × 3 + 55] : 5 = 35
(4x + 28) × 3 + 55 = 35 × 5
(4x + 28) × 3 + 55 = 175
(4x + 28) × 3 = 175 - 55
(4x + 28) × 3 = 120
4x + 28 = 120 : 3
4x + 28 = 40
4x = 40 - 28
4x = 12
x = 12 : 4
x = 3
c) (455 × x : 2 × 6) : 5 = 31
455 × x : 2 × 6 = 31 × 5
455 × x : 2 × 6 = 155
x × 455 : 2 × 6 = 155
x × 1365 = 155
x = 155 : 1365
x = 31/273
d) 128 × x - 12 × x - 16 × x = 520800
(128 - 12 - 16) × x = 520800
100 × x = 520800
x = 520800 : 100
x = 5208
e) (x × 0,25 + 2022) × 2023 = (50 + 2022) × 2023
(x × 0,25 + 2022) × 2023 = 2072 × 2023
(x × 0,25 + 2022) × 2023 = 4191656
x × 0,25 + 2022 = 4191656 : 2023
x × 0,25 + 2022 = 2072
x × 0,25 = 2072 - 2022
x × 0,25 = 50
x = 50 : 0,25
x = 200
f) 4 × x + 100 = x + 280
4 × x - x = 280 - 100
(4 - 1) × x = 180
3 × x = 180
x = 180 : 3
x = 60
g) (x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 7450
x + 1 + x + 2 + x + 3 + ... + x + 100 = 7450
100 × x + 100 × 101 : 2 = 7450
100 × x + 5050 = 7450
100 × x = 7450 - 5050
100 × x = 2400
x = 2400 : 100
x = 24
\(7x-8=718\\ \Rightarrow7x=718+8\\ \Rightarrow7x=726\\ \Rightarrow x=726:7\\\Rightarrow x=\dfrac{726}{7}\) \(246-3\left(x+2\right)=120\\ \Rightarrow3\left(x+2\right)=246-120\\ \Rightarrow3\left(x+2\right)=126\\ \Rightarrow x+2=126:3\\ \Rightarrow x+2=42\\ \Rightarrow x=42-2=40\)
` X xx 5,5 + X xx 3,5 + X = 98,6`
`X xx (5,5 + 3,5 + 1) = 98,6`
`X xx 10 = 98,6`
` X = 98,6 : 10`
`X = 9,86`
1) x = 12,3 - 2,3 + 4,5 = 5,5
2) x = 24,4 - 19,44 = 4,96
3) x = 831,6
Nhớ bấm L I K E nhá :))
\(a,\left(x-15\right)\times7-270=169\times45\\ \left(x-15\right)\times7-270=7605\\ \left(x-15\right)\times7=7605+270\\ \left(x-15\right)\times7=7875\\ x-15=7875:7\\ x-15=1125\\ x=1125+15\\ x=1140\\ b,64-\left(34\times x-8\right)=4\\ 34\times x-8=64-4\\ 34\times x-8=60\\ 34\times x=60+8\\ 34\times x=68\\ x=68:34\\ x=2\)
15,1 - \(x\) + 3,2 = 4,5
15,1 - \(x\) = 4,5 - 3,2
15,1 - \(x\) = 1,3
\(x\) = 15,1 - 1,3
\(x\) = 13,8
bài 1
a, X/Y x 1/5=3/10
X/Y=3/10:1/5
X/Y=3/2
b, 3/4 x X/Y= 6/5
X/Y=3/4:6/5
X/Y=5/8
Bài 2:
a, > b, < c,= d,<
432/45 + 14.7 = 24.3
823.2 / 8.4 - 98 = 0
(754.4 + 333.1 ) / 12.5 = 87
\(\frac{432}{45}+x=24,3\)
\(\Leftrightarrow9,6+x=24,3\)
\(\Leftrightarrow x=24,3-9,6=14,7\)
\(823,2:84-x=0\)
\(\Leftrightarrow98-x=0\Leftrightarrow x=98\)
\(\frac{754,4+333,1}{x}=87\)
\(\Leftrightarrow754,4+333,1=87x\)
\(\Leftrightarrow1087,5=87x\)
\(\Rightarrow x=1087,5:87=12,5\)
a.
\(4,32\times4,5+x=24,4\)
\(\Leftrightarrow19,44+x=24,4\)
\(\Leftrightarrow x=24,4-19,44\)
\(\Leftrightarrow x=-4,76\)
b.
\(823,2+8,4-x=0\)
\(\Leftrightarrow831,6-x=0\)
\(\Leftrightarrow x=831,6\)
c.
\(\left(245,8+x\right)\times8=270\times8\)
\(\Leftrightarrow245,8+x=270\times8:8\)
\(\Leftrightarrow245,8+x=270\)
\(\Leftrightarrow x=270-245,8\)
\(\Leftrightarrow x=24,2\)