93x4x216)2 : (11 x 213 x 411 - 16)19
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11 - (x+48) = 97
=> x + 48 = 97 - 11
=> x + 48 = 86
=> x = 86 - 48
=> x = 38
vậy____
-(x+48) + 213 = -16
=> -x - 48 = -16 - 213
=> -x - 48 = -229
=> -x = -229 + 28
=> -x = -201
=> x = 201
vậy____
1, 11-(x+48)=97
\(\Rightarrow x+48=11-97\)
\(\Rightarrow x+48=-86\)
\(\Rightarrow x+48=-134\)
Vậy x=134
2,-(x+48)+213=-16
\(\Rightarrow-\left(x+48\right)=-16-213\)
\(\Rightarrow-\left(x+48\right)=-229\)
\(\Rightarrow x+48=229\)
\(\Rightarrow x=229-48\)
\(\Rightarrow x=181\)
Vậy x=181
a) -x - 84=-16-213
-x-84=-229
-84+229=x
145 =x
b) /x+2/= 316
suy ra x+2=316 hoac x+2=-316
* x+2 = 316
x = 314
* x+2 =-316
x = -318
vay x=314 hoac x=-318
c) /x+7/=15
suy ra x+7=15 hoac x+7=-15
x+7=15
x = 8
x+7= -15
x = -22
vay x= 8 hoac x=-22
d) 19-4=/x-1/
15=/x-1/
suy ra x-1=15 hoac x-1=-15
x-1=15
x = 16
x-1=-15
x= -14
vay x=16 hoac x=-14
\(-\left(x+84\right)+213=-16\)
\(=>-x-84+213=-16\)
\(=>-x=-16+84-213=-145\)
\(=>x=145\)
\(\left|x+2\right|=341+\left(-25\right)\)
\(=>\left|x+2\right|=341-25=316\)
\(=>\orbr{\begin{cases}x+2=316\\x+2=-316\end{cases}}\)
\(=>\orbr{\begin{cases}x=314\\x=-318\end{cases}}\)
461 + (x - 45) = 387
x - 45 = 387 - 461
x - 45 = -74
x = -74 + 45
x = -29
11 - (-53 + x) = 97
-53 + x = 11 - 97
-53 + x = -86
x = -86 - -53
x = -33
- (x+84) + 213 = -16
x - 84 + 213 = -16
x - 84 = -16 - 213
x - 84 = -229
x = -229 + 84
x = -145
461 + ( x - 45 ) = 387
x - 45 = 387 - 461
x - 45 = - 74
x = - 74 + 45
x = - 29
Vậy x = - 29
\(A=\dfrac{1}{5}\left(\dfrac{1}{6}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{16}+...+\dfrac{1}{496}-\dfrac{1}{501}\right)\)
\(=\dfrac{1}{5}\cdot\dfrac{55}{334}=\dfrac{11}{334}\)
\(B=1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+...+\dfrac{1}{19}-\dfrac{1}{21}=\dfrac{20}{21}\)
a)11-(-53+x)=97
11+53+x=97
64+x+97
x=97-64
x=33
b)-(x+84)+213=-16
-(x+84)=-16-213
-(x+84)=-229
-x=-229-84
-x=-313
x=313
11- (x+84) = 97
=> 11 -x - 84 = 97
=> 11-x = 181
=> x= 11- 181
=> x= -170
cấc câu sau làm tương tự
\(\left(19x+2.5^1\right):14=\left(13-8\right)^2-4^2.\)
\(\left(19x+10\right):14=5^2-4^2\)
\(\left(19x:4\right)+\left(10:4\right)=25-16\)
\(\left(19x:4\right)+\frac{5}{2}=9\)
\(19x:4=9-\frac{5}{2}\)
\(19x:4=\frac{13}{2}\)
\(19x=\frac{13}{2}.4=26\)
\(x=\frac{26}{19}\)