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Bài 6:
\(21,251+6,058+0,749+1,042\)
\(=\left(21,251+0,749\right)+\left(6,058+1,042\right)\)
\(=22+7,1\)
\(=29,1\)
___________________
\(1,53+5,309+12,47+5,691\)
\(=\left(1,53+12,47\right)+\left(5,309+5,691\right)\)
\(=14+11\)
\(=25\)
5:
a: =>x/17=5/17
=>x=5
b; =>6+x=7/11*33=21
=>x=15
c: \(\dfrac{12+x}{43-x}=\dfrac{2}{3}\)
=>3x+36=86-2x
=>5x=50
=>x=10
d: \(\dfrac{x}{5}< \dfrac{3}{7}\)
=>x<3/7*5
=>x<15/7
f: 15/26+x/16=46/52
=>x/16=23/26-15/26=8/26=4/13
=>x=4/13*16=64/13
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#giải:
125 . 456 + 456 . 31 - 256 . 444
= 456 . ( 125 + 31 ) - 256 . 444
= 456 . 256 - 256 . 444
= 256 . ( 456 - 444 )
= 256 . 12
= 3072
#By_Ami
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456 - 4(x+52) = 185
4(x+52)=271
x+52=67,75
x=15,75
=.= hok tốt!!
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a) \(234+\left(345-x\right)=500\)
\(345-x=500-234\)
\(345-x=266\)
\(x=79\)
vay \(x=79\)
b) \(456-\left(x+23\right)=326\)
\(x+23=456-326\)
\(x+23=130\)
\(x=107\)
vay \(x=107\)
c) \(\left(5x-15\right):5=0\)
\(5x-15=0\)
\(5x=15\)
\(x=3\)
vay \(x=3\)
d) \(84-4\left(2x+1\right)=48\)
\(8x+4=84-48\)
\(8x+4=36\)
\(8x=32\)
\(x=4\)
vay \(x=4\)
e) \(\left(x-76\right).54=0\)
\(x-76=0\)
\(x=76\)
vay \(x=76\)
f) \(\left(x-3\right)\left(x+4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x+4=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
vay \(\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
g) \(\left(x-6\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-6=0\\x-7=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
vay \(\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
h) \(\left(x-2\right)\left(x-3\right)\left(x-5\right)=0\)
\(\Rightarrow x-2=0\Rightarrow x=2\)hoac \(\orbr{\begin{cases}x-3=0\\x-5=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=5\end{cases}}\)
vay \(x=2\)hoac \(\orbr{\begin{cases}x=3\\x=5\end{cases}}\)
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`@` `\text {Ans}`
`\downarrow`
`456 \div 2 \times 18 + 456 \div 3 - 102`
`= 456 \times 1/2 \times 18 + 456 \times 1/3 - 102`
`= 456 \times (1/2 \times 18 + 1/3) - 102`
`= 456 \times ( 9 + 1/3) - 102`
`= 456 \times 28/3 - 102`
`= 4256 - 102`
`= 4154`
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`456 \div2\times18 + 456\div3 - 102`
`= 456\times0,5\times18 + 456\times1/3 - 102`
`= 456\times (0,5 \times 18 + 1/3) - 102`
`= 456 \times(9 + 1/3) - 102`
`= 456 \times28/3 - 102`
`= 4256 - 102`
`= 4154`
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu a
2015 :x+53=456
2015 :x=456 - 53
2015: x=403
X =2015: 403
X=5
B)x+ 9, 44= 18, 36
X = 18, 36 - 9, 44
X = 8, 92
Vậy x bằng 8, 92
a) 2015:x+53=456
2015:x =456-53
2015:x =403
x =2015:403
x =5
b) x+9,44=18,36
x =18,36-9,44
x =8,92
c)x-\(\frac{3}{4}\)=6x\(\frac{1}{24}\)
x-\(\frac{3}{4}\) = \(\frac{1}{4}\)
x =\(\frac{1}{4}+\frac{3}{4}\)
x =1
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a) ( x - 1954 ) .5 = 50
=> x - 1954 = 50 : 5 = 10
=> x = 10 + 1954 = 1964.
b) ( x - 1975 ) . 2017 = 0
=> x - 1975 = 0
=> x = 0 + 1975 = 1975.
c) ( 2x - 6 ) . ( x - 2 ) = 0
=> 2x - 6 = 0 hoặc x - 2 = 0.
=> 2x = 6 hoặc x = 2
=> x = 3 hoặc x = 2.
d) 456 - ( x + 23 ) = 326
=> x + 23 = 456 - 326 = 130
=> x = 130 - 23
=> x = 107
e) 84 + 4 . (2x + 1) = 48
=>4.(2x + 1) = 48 - 84 = -36
=>2x + 1 = -36 : 4 = -9
=>2x = -9 + 1 = -8
=>x = -8 : 2 = -4
a, ( x - 1954 ) . 5 = 50
x - 1954 = 50 : 5
x - 1954 = 10
x = 10 + 1954
x = 1964
Các câu khác tương tự nhé
340.(4456-x)=0
=4456-x=0
=x=4456