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(x+21)-75=39
x+21 = 39 + 75
x+21 = 114
x = 114 - 21
x = 93
vậy........
11(x-9)=781
x-9 = 781 : 11
x-9 = 71
x = 71 + 9
x = 80
vậy.........
280:(x-8)=14
x-8 = 280 : 14
x-8 = 20
x = 20 + 8
x = 28
vậy......
6(x+41)=600
x+41 = 600 : 6
x+41 = 100
x = 100 - 41
x = 59
vậy.............
15 ( x-9)=1050
x-9 = 1050 : 15
x-9 = 70
x = 70 + 9
x = 79
vậy..........
1 , ( x + 21 ) - 75 = 39
x + 21 =39+75
x + 21 =114
x =114 - 21
x = 93 Vậy x=93
2, 11(x-9)=781
x-9=781/11
x-9=71
x=71+9
x =80
Vậy x =80
3) 280/ (x-8)=14
x-8 =280/14
x-8 =20
x=20+8
x=28
Vậy x =28
\(\dfrac{\dfrac{36}{41}:\dfrac{9}{41}}{\dfrac{14}{21}:\dfrac{7}{21}}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{\dfrac{36}{41}\times\dfrac{41}{9}}{\dfrac{14}{21}\times\dfrac{21}{7}}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{4}{2}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{4}{5}\)
\(a,\)\(x+\frac{4}{5.9}+\frac{4}{9.13}+\frac{4}{13.17}+...+\frac{4}{41.45}=-\frac{37}{45}\)
\(x+\left(\frac{9-5}{5.9}+\frac{13-9}{9.13}+\frac{17-13}{13.17}+...+\frac{45-41}{41.45}\right)=-\frac{37}{45}\)
\(x+\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}+....+\frac{1}{41}-\frac{1}{45}\right)-\frac{37}{45}\)
\(x+\left(\frac{1}{5}-\frac{1}{45}\right)=-\frac{37}{45}\)
\(x+\frac{8}{45}=-\frac{37}{45}\)
\(x=-\frac{37}{45}-\frac{8}{45}\)
\(x=-1\)
a)[(\(\frac{36}{41}\): \(\frac{9}{41}\)) : (\(\frac{14}{21}\):\(\frac{7}{21}\)) x \(\frac{2}{5}\)]
=[ 4 : 2 x \(\frac{2}{5}\)]
=\(\frac{4}{5}\)
b) (\(\frac{1}{2}\)- \(\frac{1}{4}\)+\(\frac{1}{5}\)) : (\(\frac{1}{2}\)+ \(\frac{1}{4}\)'- \(\frac{1}{5}\))
=\(\frac{9}{20}\): \(\frac{11}{20}\)
=\(\frac{9}{11}\)
( Mình tính luôn cho nó nhanh phần cuối cùng nhá)
=\(\frac{4}{5}\): \(\frac{3}{5}\)
=\(\frac{4}{3}\)
−(32)+(𝑥−21)=−1
−32+𝑥−21=−1
−53+𝑥=−1
𝑥−53=−1
𝑥−53+53=−1+53
𝑥=52
\(\text{-(41-9)+(x-21)=-1}\\ -41+9+x-21=-1\\ -32+x-21=-1\\ -32+x=-1+21\\ -32+x=20\\ x=20-\left(-32\right)\\ x=52\)