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a) |x + 4| = 17
=> \(\orbr{\begin{cases}x+4=17\\x+4=-17\end{cases}}\)
=> \(\orbr{\begin{cases}x=13\\x=-21\end{cases}}\)
b) (7 - x) - (25 + 7) = -25
=> (7 - x) - 32 = -25
=> 7 - x = -25 + 32
=> 7 - x = 7
=> x = 7 - 7
=> x = 0
c. |x + 5| = |-7|
=> |x + 5 | = 7
=> \(\orbr{\begin{cases}x+5=7\\x+5=-7\end{cases}}\)
=> \(\orbr{\begin{cases}x=2\\x=-12\end{cases}}\)
2) 4 . (-5)2 + 2 . (-15)
= 2. 2 . 25 + 2 . (-15)
= 2.(2 . 25 - 15)
= 2 . 35
= 70
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\(9\frac{7}{25}+\frac{3}{25}\cdot\frac{7}{11}-\frac{7}{25}\cdot\frac{14}{11}\)
\(=9\frac{7}{25}+\frac{3}{25}\cdot\frac{7}{11}-\frac{14}{25}\cdot\frac{7}{11}\)
\(=9\frac{7}{25}+\frac{7}{11}\cdot\left(\frac{3}{25}-\frac{14}{25}\right)\)
\(=9\frac{7}{25}+\frac{7}{11}\cdot\left(-\frac{11}{25}\right)\)
\(=9\frac{7}{25}+\left(-\frac{7}{25}\right)\)
\(=9\)
Chắc sai =]]
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9-25=(7-x)-(25+7)
( 7 - x ) - ( 25 + 7 ) = 9 - 25
( 7 - x ) - 32 = - 16
7 - x = ( - 16 ) + 32
7 - x = 16
x = 7 - 16
x = - 9
Vậy x = - 9
9 - 25 = ( 7 - x ) - ( 25 + 7 )
x = 7 - 25 - 7 - 9 + 25
x = ( 7 - 7 ) + ( 25 - 25 ) -9
x = 0 + 0 - 9
x= - 9
=> x= - 9
Vậy x = - 9
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tớ chỉ làm được phần a)thôi
ta có:\(\left(x-\frac{2}{3}\right):\frac{-3}{7}=\frac{-9}{11}\)
\(x-\frac{2}{3}=\frac{-9}{11}.\frac{-3}{7}\)
\(x-\frac{2}{3}=\frac{27}{77}\)
\(x=\frac{27}{77}+\frac{2}{3}\)
\(x=\frac{235}{231}\)
vậy x=\(\frac{235}{231}\)
a) \(\left(x-\frac{2}{3}\right)\):\(\frac{-3}{7}\)=\(\frac{-9}{1}\)
\(x-\frac{2}{3}\)=\(-9\cdot\frac{-3}{7}\)
\(x-\frac{2}{3}\)= \(\frac{27}{7}\)
\(x\)= \(\frac{27}{7}\)\(+\frac{2}{3}\)
\(x\)=\(\frac{95}{21}\)
b)\(x:2+x:\frac{5}{2}+x:\frac{1}{3}=\frac{-18}{25}\)
\(x:\left(2+\frac{5}{2}+\frac{1}{3}\right)=\frac{-18}{25}\)
\(x:\frac{12+15+2}{6}=\frac{-18}{25}\)
\(x:\frac{29}{6}=\frac{-18}{25}\)
\(x=\frac{-18}{25}\cdot\frac{29}{6}\)
\(x=\frac{-87}{25}\)
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7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
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b)(1-3-5+7)+(9-11-13+15)+...+(2009-2011-2013+2015)
=0+0+...+0
=0
ak ko cần trả lời nữa .. trả lời cũng đc .. xin lỗi nhé
-16=7-x-25-7
-16=x-25
x=-16+25
x=9
học tốt