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a.
a-285+85=2495
=>a=2495+285-85
=>a=2695
b.
2748 - a + 8593 = 10495
=>11341-a=10495
=>a=11341-10495
=>a=846
c.
b:7xx34=8704
=>b:7=256
=>b=1792
d.
85 x b : 11 = 425
=>b:11=5
=>b=55
a.
a-285+85=2495
=>a=2495+285-85
=>a=2695
b.
2748 - a + 8593 = 10495
=>11341-a=10495
=>a=11341-10495
=>a=846
c.
b:7xx34=8704
=>b:7=256
=>b=1792
d.
85 x b : 11 = 425
=>b:11=5
=>b=55
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(42-x\right)\times8=264\)
\(\Leftrightarrow42-x=264\div8\)
\(\Leftrightarrow42-x=33\)
\(\Leftrightarrow x=42-33\)
\(\Leftrightarrow x=9\)
\(\left(x-46\right)\div8=33\)
\(\Leftrightarrow x-46=33\times8\)
\(\Leftrightarrow x-46=264\)
\(\Leftrightarrow x=264+46\)
\(\Leftrightarrow x=310\)
a,(42-x)*8=264
42-x =264:8
42-x =33
x =42-33
x =9
b,(x-46):8=33
x-46 =33*8
x-46 =264
x =264+46
x =310
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 297 : ( x - 5 ) = 33
x - 5 = 297 : 33
x - 5 = 9
x = 9 + 5
x = 14
a, 297 : (x-5) = 33
x-5 = 297 : 33
x-5 = 9
x = 9 + 5
x = 14
b, x*5 + x*7 + x*8 = 680
x*(5+7+8) = 680
x*20 = 680
x = 680 : 20
x = 34
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 28 + X x 2 = 600
X x ( 28 + 2 ) = 600
X x 30 = 600
X = 600 : 30
X = 20
![](https://rs.olm.vn/images/avt/0.png?1311)
18 x 123 + 9 x 4567 x 2 + 3 x 5310 x 6
= 18 x 123 + 9 x 2 x 4567 + 3 x 6 x 5310
= 18 x 123 + 18 x 4567 + 18 x 5310
= 18 x ( 123 + 4567 + 5310 )
= 18 x 10000
= 180000
`@` `\text {Ans}`
`\downarrow`
`a)`
`2748 + x - 8593 = 10495`
`2748 + x = 10495 + 8593`
`2748 + x = 19088`
`x = 19088 - 2748`
`x = 16340`
`b)`
`8349 + x- 5993= 95902`
`8349 + x = 95902 + 5993`
`8349 + x = 101895`
`x = 101895 - 8349`
`x = 93546`