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a)
\(\dfrac{7}{5}+\dfrac{5}{6}:5-\dfrac{3}{8}\cdot\left(-3\right)\\ =\dfrac{7}{5}+\dfrac{1}{6}+\dfrac{9}{8}\\ =\dfrac{168+20+135}{120}\\ =\dfrac{323}{120}\)
\(\Leftrightarrow\left\{x^2-\left[6^2-\left(64-63\right)^3-7\cdot5\right]^3\right\}=1\)
\(\Leftrightarrow\left\{x^2-\left[36-1-35\right]^3\right\}=1\)
\(\Leftrightarrow x^2=1\Rightarrow x=1\)
{ x2 - [ 62 - ( 82 - 9.7)3 - 7.5]3 - 5.3 }3 = 1
{ x2 + [ 36 - (64 - 63)3 - 35]3 - 15}3 = 1
[ x2 - ( 36 - 13 - 35 ) - 15 ]3 = 1
[ x2 - ( 36 - 1 - 35 ) - 15]3 = 1
[ x2 - ( 35 - 35 ) - 15]3 = 1
[ x2 - 0 - 15]3 = 1
( x2 - 15 )3 = 1
<=> ( x2 - 15)3 = 13
=> x2 - 15 = 1
<=> x2 = 16
=> x = 4
{ x2 - [ 62 - ( 82 - 9.7)3 - 7.5]3 - 5.3 }3 = 1
{ x2 + [ 36 - (64 - 63)3 - 35]3 - 15}3 = 1
[ x2 - ( 36 - 13 - 35 ) - 15 ]3 = 1
[ x2 - ( 36 - 1 - 35 ) - 15]3 = 1
[ x2 - ( 35 - 35 ) - 15]3 = 1
[ x2 - 0 - 15]3 = 1
( x2 - 15 )3 = 1
<=> ( x2 - 15)3 = 13
=> x2 - 15 = 1
<=> x2 = 16
=> x = 4
\(8.6+288:\left(x-3\right)^2=50\)
\(\Rightarrow48+288:\left(x-3\right)^2=50\)
\(\Rightarrow288:\left(x-3\right)^2=50-48\)
\(\Rightarrow288:\left(x-3\right)^2=2\)
\(\Rightarrow\left(x-3\right)^2=288:2\)
\(\Rightarrow\left(x-3\right)^2=144\)
\(\Rightarrow x-3=144\) hoặc \(x-3=-144\)
\(\Rightarrow x=147\) \(\Rightarrow x=-141\)
tíc mình nha
1) (96 + 97) : 95
=96:95+97:95
=5 + 52
=5+25
=30
2) .......(tự chép đè nhé)....
4A = 4 x 42 x 43 x 44 +...+ 420 + 421
4A - A = 421 - 4
3A = 421- 4
A = (421 - 4 ) : 3
bài này mình làm rùi , yên tâm.
k nha
ne ban minh biet cau tra loi nhung lam the nao bam ngoac vuong
92.(5x-2)3=37
81.(5x-2)3=2187
(5x-2)3=2187:81
(5x-2)3=27
suy ra :33=27
25 x 67 : ( 211 x 36 )
= 32 x 279936 : ( 2048 x 729 )
= 8957952 : 1492992
= 6
= 6 nhé bn