x/8 +1/5 =3/20 -1
=
=
=
ai nhanh mình bấm
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a. =3/8 + 1/2 :(9/16) - 3/16
=3/8 + 8/9 - 3/16
=155/144
b. =7/27*3/2 + 1/2 : 1/6
=7/18 + 3
=61/18
Đặt \(A=\frac{1.2+2.4+3.6+4.8+5.10}{4+6.8+9.12+12.16+15.20}\)
\(\Rightarrow A=\frac{1.\left(1+2\right)+2.\left(1+2\right)+3.\left(1+2\right)+4.\left(1+2\right)+5.\left(1+2\right)}{4+2.\left(3+4\right)+3.\left(3+4\right)+4.\left(3+4\right)+5.\left(3+4\right)}\)
\(\Rightarrow A=\frac{\left(1+2+3+4+5\right).\left(1+2\right)}{4+\left(2+3+4+5\right).\left(3+4\right)}\)
\(\Rightarrow A=\frac{\left(1+5\right).5:2.\left(1+2\right)}{4+\left(2+5\right).4:2.\left(3+4\right)}\)
\(\Rightarrow A=\frac{6.5:2.3}{4+7.4:2.7}=\frac{45}{4+98}=\frac{45}{102}=\frac{15}{34}\)
Vậy \(A=\frac{15}{34}\)
Chúc bn học tốt
\(\left(x+2\right)+\left(x+4\right)+...+\left(x+20\right)=160\)
\(x+2+x+4+...+x+20=160\)
\(\left(x+x+x+...+x\right)+\left(2+4+...+20\right)=160\)
\(x\cdot20+\frac{\left(20+2\right)\cdot\left(\left(20-2\right):2+1\right)}{2}=160\)
\(x\cdot20+110=160\)
\(x\cdot20=160-110\)
\(x\cdot20=50\)
\(x=50:20\)
\(x=2,5\)
Vậy \(x=2,5\)
[ x + 2 ] + [ x + 4 ] + [ x + 6 ] + ... + [ x + 20 ] = 160
( 20 + 2 ) x 10 : 2 + 10x = 160
22 x 10 : 2 + 10x = 160
220 : 2 + 10x = 160
110 + 10x = 160
10x = 160 - 110
10x = 50 ; x = 5
[ 1/2 + 1/4 + 1/8 + ... + 1.64 ] /x = 3/8
=> [ ( 1/2 + 1/4 ) + ( 1/8 + 1/16 ) + ( 1/32 + 1/64 ) ] / x = 3/8
[ 3/4 + 3/16 + 3/64 ] / x = 3/8
[ 48/64 + 12/64 + 3/64 ] / x = 3/8
=> 63/64x = 3/8
=> 64x = 21 x 8
64x = 168
x = 2,625
k chắc nha
22x-1 + 6 . 28 = 14.28
=> 22x-1 + 6 . 28 = 7.2.28
=> 22x-1 + 6 . 28 = 7 . 29
=> 22x-1 + 6 = 7 . 29 : 28
=> 22x-1 + 6 = 7 . 2
=> 22x-1 + 6 = 14
=> 22x-1 = 8
=> 22x-1 = 23
=> 2x - 1 = 3
=> 2x = 4
=> x = 2
X = \(2\frac{3}{7}\)X \(\frac{1}{2}\)- \(\frac{1}{2}\)X \(\frac{3}{7}\)+ \(\frac{1}{3}\)= \(\frac{17}{7}\)X \(\frac{1}{2}\)- \(\frac{1}{2}\)X \(\frac{3}{7}\)+ \(\frac{1}{3}\)
= \(\frac{17}{14}\)- \(\frac{3}{14}\)+ \(\frac{1}{3}\)
= 1 + \(\frac{1}{3}\)
= \(\frac{4}{3}\)
nhớ tk cho mk nha, mk trả lời sớm nhất
tử số = 2^10 . 3^8 - 2^10 . 3^9 = 2^10 . 3^8 . (1-3)
mẫu số = 2^10 . 3^8 + 3^8 . 2^10 . 5 = 2^10 . 3^8 . (1+5)
Đ/S: \(\frac{1-3}{1+5}\)=\(\frac{-1}{3}\)
\(\frac{x}{8}+\frac{1}{5}=\frac{3}{20}-1\)
\(\frac{x}{8}+\frac{1}{5}=\frac{3}{20}-\frac{20}{20}\)
\(\frac{x}{8}+\frac{1}{5}=\frac{-17}{20}\)
\(\frac{x}{8}\)\(=\)\(\frac{-17}{20}-\frac{1}{5}\)
\(\frac{x}{8}\)\(=\)\(\frac{-17}{20}-\frac{4}{20}\)
\(\frac{x}{8}\)\(=\)\(\frac{-21}{20}\)
\(x\)\(=\)\(\frac{-21}{20}\times8\)
\(x\)\(=\)\(\frac{-168}{20}\)\(=\frac{-41}{5}\)
x/8 + 1/5 = 3/20 - 1
x/8 + 1/5 = -17/20
x/8 = -17/20 - 1/5
x/8 = - 21/20
x = -21/20 . 8
x =-42/5