x + 12 = 43
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D = 3\(\dfrac{1}{2}\) \(\times\) \(\dfrac{12}{43}\) + \(\dfrac{49}{14}\) \(\times\) \(\dfrac{31}{43}\) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2}\) \(\times\) \(\dfrac{12}{43}\) + \(\dfrac{7}{2}\) \(\times\) \(\dfrac{31}{43}\) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2\times43}\) \(\times\) (12 + 31) + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2\times43}\) \(\times\) 43 + \(\dfrac{11}{2}\)
D = \(\dfrac{7}{2}\) + \(\dfrac{11}{2}\)
D = 9
D = 3 và 1/2 x 12/43 + 49/14 x 31/43 + 11/2
= 7/2 x 12/43 + 49/14 x 31/43 + 11/2
= 42/43 + 217/36 + 11/2
=9
# https://lazi.vn/user/tnsociu
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\(x-\dfrac{12}{8\cdot11}-\dfrac{12}{11\cdot14}-\dfrac{12}{14\cdot17}-...-\dfrac{12}{32\cdot35}=\dfrac{43}{70}\) (phải là `32*35` chứ nhỉ?)
\(x-\left(\dfrac{12}{8\cdot11}+\dfrac{12}{11\cdot14}+\dfrac{12}{14\cdot17}+...+\dfrac{12}{32\cdot35}\right)=\dfrac{43}{70}\)
\(x-4\left(\dfrac{3}{8\cdot11}+\dfrac{3}{11\cdot14}+\dfrac{3}{14\cdot17}+...+\dfrac{3}{32\cdot35}\right)=\dfrac{43}{70}\)
\(x-4\left(\dfrac{1}{8}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{14}+\dfrac{1}{14}-\dfrac{1}{17}+...+\dfrac{1}{32}-\dfrac{1}{35}\right)=\dfrac{43}{70}\)
\(x-4\left(\dfrac{1}{8}-\dfrac{1}{35}\right)=\dfrac{43}{70}\\ x-4\cdot\dfrac{27}{280}=\dfrac{43}{70}\)
\(x-\dfrac{27}{70}=\dfrac{43}{70}\\ x=\dfrac{43}{70}+\dfrac{27}{70}\\ x=\dfrac{70}{70}=1\)
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\(3-x=12\)
\(x=3-12\)
\(x=-9\)
\(\left|-10\right|+x=\left|-14\right|\)
\(10+x=14\)
\(x=14-10\)
\(x=4\)
\(21+x=\left|-11\right|\)
\(21+x=11\)
\(x=11-21\)
\(x=-10\)
\(x-\left|-43\right|=15\)
\(x-43=15\)
\(x=15+43\)
\(x=58\)
\(x+\left|-70\right|=-43\)
\(x+70=-43\)
\(x=-43-70\)
\(x=-113\)
Ủng hộ mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left[43-\left(56-x\right)\right]\times12=384\)
\(43-\left(56-x\right)=384:12\)
\(43-\left(56-x\right)=32\)
\(56-x=43-32\)
\(56-x=11\)
\(x=56-11\)
\(x=45\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 10:
\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)
câu 11:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) x = 43 30 x = − 43 30 ; b ) x = 3 2 x = 7 6 . c ) x = 13 6 x = 1 2
d ) x = − 94 45 x = 164 45 ; e ) x = 7 8 x = − 3 8 . f ) x = 7 8 x = − 3 8
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\(-12\left(7-72\right)-25\left(55-43\right)\)
\(=-12\cdot\left(-65\right)-25\cdot12\)
\(=12\cdot65-25\cdot12\)
\(=12\left(65-25\right)\)
\(=12\cdot40=480\)
−12(7−72)−25(55−43)
=−12⋅(−65)−25⋅12
=12⋅65−25⋅12
=12(65−25)
=12⋅40
=480
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 12/43 - x = 2/3
0x + 12/43 = 2/3
12/43 = 2/3 (vô lý)
Vậy không có x nào là nghiệm của phương trình.
x + 12 = 43
x = 43 - 12
x = 31
x + 12 = 43
x = 43 - 12
x = 31