a) 25 - ( 25 - x ) = 12 + ( 42 - 65 )
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\(25-\left(25-x\right)=12+\left(42-65\right).\)
\(\Leftrightarrow25-25+x=12-23.\)
\(\Leftrightarrow x=-11.\)
Vậy \(x=-11.\)
25 - ( 25 - x ) = 12 + ( 42 - 65 )
25 - ( 25 - x ) = 12 + (-23)
25 - ( 25 - x ) = -11
25 - x = 25 - (-11)
25 - x = 36
x = 25 - 36
x = -11
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g) (15 + 37) + (52 – 37 – 17) = 15 + 37 + 52 – 37 – 17 = 15 + 52 – 17 = 50 h) (38 – 42 +14) - (38 – 42 - 15) = 38 – 42 +14 - 38 + 42 + 15 = 14 + 15 = 29 i) (27 + 65 ) + (346 - 27- 65) = 27 + 65 + 346 - 27- 65 = 346 k) - (27 + 65) - (346 – 27 - 65) = -27 - 65 - 346 + 27 + 65 = -346 l) (42 – 69 + 17) - (42 + 17) = 42 – 69 + 17 - 42 - 17 = – 69 m) 24. (16 - 5) – 16. (24 – 5 ) = 24. 16 - 24 . 5 - 16 . 24 + 16. 5 = - 24 . 5 + 16. 5 = -8 . 5 = -40 n) (-12). 47 – 12 . 52 + (-12) = -12 (47 - 52 + 1) = -12 . (-4) = 48 p) 51 . (69 - 25) – 69. (51 - 25) = 51 . 69 - 51 . 25 – 69. 51 + 69. 25 = - 51 . 25 + 69. 25 = (- 51+ 69).25 = 450 |
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a) \(25-\left(25-x\right)=12+\left(42-65\right)\)
\(25-\left(25-x\right)=12+\left(-23\right)\)
\(25-\left(25-x\right)=-11\)
\(25-x=25-\left(-11\right)\)
\(25-x=36\)
\(x=25-36\)
\(x=-11\)
Làm 2 câu dài cho bạn nhá! Mấy câu ngắn tương tự!
a, \(25-\left(25-x\right)=12+\left(42-65\right)\)
\(\Rightarrow25-25+x=12+42-65\)
\(\Rightarrow x=-11\)
b, \(215+\left(-38\right)-54+90-\left(-48+x\right)=0\)
\(\Rightarrow215-38-54+90+48-x=0\)
\(\Rightarrow x=261\)
m, \(\left|x\right|-5=12\)
\(\Rightarrow\left|x\right|=17\Rightarrow\left\{{}\begin{matrix}x=-17\\x=17\end{matrix}\right.\)
Chúc bạn học tốt!!!
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a) 25-(25-x)=12+(42-65)
25-25+x=12+(-23)
0+x=(-11)
x=(-11)-0
x=(-11)
b) Cách 1: 31-(17+x)=18
17+x=31-18
17+x=13
x=13-17
x= (-4)
Cách 2: 31-(17+x)=18
31-17-x=18
14-x=18
x=14-18
x= (-4)
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a) − 105 + − 25 + ( − 105 ) + 50
= 105 + 25 + ( - 105) + 50
= [105 + ( -105)] + ( 25 + 50 )
= 0 + 75 = 75
b) 465 + − 38 + − 465 − 12 − − 42
= 465 + ( - 38) + ( -465) – 12 – 42
= [ 465 + (- 465) ] – ( 12 + 42 )
= 0 – 54 = 0 + ( -54 ) = -54
c) 65. − 19 + − 19 .24 + − 19 .11
= ( - 19) . ( 65 + 24 + 11 )
= ( -19) . 100 = -1900
d) − 3 2 + 2 3 − − 5 2 + 4 3
= 9 + 8 – 25 + 64 = 56
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a,=-56-30-12 b,=-20.-2.3.25
=-86-12 =40.3.25
=-98 = 120.25
=3000
25 - (25 - x) = 12 + (42 - 65)
25 - 25 + x = 12 + (-23)
x = - 11
\(25-\left(25-x\right)=12+\left(42-65\right).\)
\(\Leftrightarrow25-25+x=12-23.\)
\(\Leftrightarrow x=-11.\)
Vậy \(x=-11.\)