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a) 15 x y - 2009 = 1201
\(15.x.y=1201+2009\)
\(15.x.y=3210\)
\(x.y=3210:15\)
\(x.y=214\)
Tới đây bó tay
b)[(z + 32) - 15 ] . 2 = 60
\(\left(z+32\right)-15=60:2\)
\(\left(z+32\right)-15=30\)
\(\left(z+32\right)=30+15\)
\(z+32=45\)
\(z=45-32\)
\(z=13\)
c)[161 + (153-z)] .18 = 3870
\(161+\left(153-z\right)=3870:18\)
\(161+\left(153-z\right)=215\)
\(153-z=215-161\)
\(153-z=54\)
\(-z=54-153\)
\(-z=-99\)
\(z=99\)
d)[43 - (56 - z)] . 12 = 384
\(43-\left(56-z\right)=384:12\)
\(43-\left(56-z\right)=32\)
\(-\left(56-z\right)=32-43\)
\(56+z=-11\)
\(z=-11-56\)
\(z=-11-56\)
\(z=-67\)
Mình có thể sai đâu đó
Mong bạn thông cảm
Chúc bạn học giỏi
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\(\left(16+23\right)+\left(153-16-23\right)\)
\(=\left(16-16\right)+\left(23-23\right)+153\)
\(=0+0+153\)
\(=153\)
#Urushi☕
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1. a) 201+20-112= 221-112= 109
b) 2190+1029-9299= 3219-9299= -5880
c) 999-999+999-999= 0+0=0
d) 291-912+12910= -693+ 12910= 12217
2. a) 29x+3029= 3870
=> 29x= 3870-3029=841
=> x= 841: 29
=> x=29
b) (x+3928)-2019= 2000000
=> x+3928= 2000000+ 2019= 2002019
=> x= 2002019
c) -3x-201=-441
=> -3x= -441+ 201= -240
=> x= 80
d) 291-293+x= 293
=> -2+x= 293
=>x= 293+2=295
e) 283+ 10x= 1283
=> 10x= 1283-283= 1000
=> x=3
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a,
= 2354 - 45 - 2354
= -45
b,
= 16 + 23 + 153 - 16 - 23
= 153
c,
= -3752 - 29 + 3632 - 51
= ( 3632 - 3752 ) - ( 29 + 51 )
= -120 - 80
= -200
a,
= 2354 - 45 - 2354
= -45
b,
= 16 + 23 + 153 - 16 - 23
= 153
c,
= -3752 - 29 + 3632 - 51
= ( 3632 - 3752 ) - ( 29 + 51 )
= -120 - 80
= -200
![](https://rs.olm.vn/images/avt/0.png?1311)
Bạn có thể viết rõ hơn ra được không ạ . Chứ mình nhìn nó ra nhiều trường hợp lắm .
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\(a,67\times153-53\times67+712:8\)
\(=67\times\left(153-53\right)+\left(712:8\right)\)
\(=67\times100+89\)
\(=6700+89\)
\(=6789\)
\(b,168-\left\{5\times\left[143-\left(15-12\right)^2\right]+10\right\}:10\)
\(=168-\left\{5\times\left[143-3^2\right]+10\right\}:10\)
\(=168-\left\{5\times134+10\right\}:10\)
\(=168-\left\{670+10\right\}:10\)
\(=168-680:10\)
\(=168-68\)
\(=100\)
\(c,\left(-13\right)+84+\left(-87\right)+16\)
\(=13+84-87+16\)
\(=\left(13+87\right)-\left(84+16\right)\)
\(=100-100\)
\(=0\)
\(d,9-\left(12-15\right)\)
\(=9-\left(-3\right)\)
\(=12\)
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\(\text{#040911}\)
\(x\cdot\left(x+1\right)\div2=153\)
\(\Rightarrow x\cdot\left(x+1\right)=153\cdot2\)
\(\Rightarrow x\cdot\left(x+1\right)=306\)
\(\Rightarrow x^2+x=306\)
\(\Rightarrow x^2+x-306=0\)
\(\Rightarrow x^2+18x-17x-306=0\)
\(\Rightarrow\left(x^2+18x\right)-\left(17x+306\right)=0\\ \Rightarrow x\left(x+18\right)-17\left(x+18\right)=0\\ \Rightarrow\left(x-17\right)\left(x+18\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-17=0\\x+18=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=17\\x=-18\end{matrix}\right.\\ \text{Vậy, x }\in\left\{-18;17\right\}.\)
(\(x\) \(\times\) (\(x\) + 1)): 2 = 153
(\(x\) \(\times\) (\(x\) + 1)) = 153 \(\times\) 2
\(x\) \(\times\) (\(x\) + 1) = 306
\(x\)2 + \(x\) = 306
\(x^2\) + \(x\) - 306 = 0
\(x^2\) - 17\(x\) + 18\(x\) - 306 =0
\(x\) \(\times\) (\(x\) - 17) + 18 \(\times\) (\(x\) - 17) = 0
(\(x\) - 17)\(\times\) ( \(x\) + 18) = 0
\(\left[{}\begin{matrix}x-17=0\\x+18=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=17\\x=-18\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{#040911}\)
\(\left[x\cdot\left(x+1\right)\right]\div2=153\\ \Rightarrow x\cdot\left(x+1\right)=153\cdot2\\ \Rightarrow x\cdot\left(x+1\right)=306\\ \Rightarrow x^2+x=306\\ \Rightarrow x^2+x-306=0\\ \Rightarrow x^2+18x-17x-306=0\\ \Rightarrow\left(x^2+18x\right)-\left(17x+306\right)=0\\ \Rightarrow x\left(x+18\right)-17\left(x+18\right)=0\\ \Rightarrow\left(x-17\right)\left(x+18\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-17=0\\x+18=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=17\\x=-18\end{matrix}\right.\\ \text{Vậy, x }\in\left\{-18;17\right\}.\)
-3701 k mik nha
\([16\times1+(153-x)]=3870\)
\(\Rightarrow16+(153-x)=3870\)
\(\Rightarrow153-x=3870-16\)
\(\Rightarrow153-x=3854\)
\(\Rightarrow x=153-3854\)
\(\Rightarrow x=-3701\)