(x-15)x7-27:45=169 mình cần gấp
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(x-15)x7-270:45=169
(x-15) x 7 - 6 = 169
(x - 15 ) x 7 = 169 + 6
( x -15) x 7 = 175
x - 15 = 175 : 7
x - 15 = 25
x = 25 + 15
x = 40
Vậy x = 40
# HOK TỐT #
(x-15) x 7 -270 : 45=169
(x-15) x 7 - 6 =169
(x-15) x 7 = 169+6
(x-15) x 7 = 175
x-15
( x - 15 ) x 7 - 270 : 45 = 169
( x - 15 ) x 7 - 6 = 169
( x - 15 ) x 7 = 175
x - 15 = 25
x = 40
( x-15 ) x7 - 270 : 45 = 169
( x - 15) x 7 =169 x 45
( x - 15) x 7 =7605
x - 15 =7605 : 7
x - 15 =7620
x =7620 + 15
x
a, 45 x 46 + 45 x 45 - 30 - 15= 45x( 46+45) -30 -15= 45 x 91 - 30 - 15= 4095 - 30 - 15= 4050
b, 891 x 29 + 29 x 8+ 29= 29 x ( 891 + 8+ 1)= 29 x 900= 26100
c, 73 x ( 84+17) + 27 x (74+27)= 73 x 101 + 27 x 101= 101 x ( 73+27)= 101 x 100= 10100
d, chịu
d, đề bài= 13 x ( 99 + 2) + 13 x 1001+ 11 x 1300= 13 x 101 + 13 x 1001+ 13 x 1100= 13 x ( 101 + 1001 + 1100) = 13 x 2202= 28626
Tính nhanh :
( x - 15 ) * 7 - 270 : 45 = 169
(x - 15) * 7 - 270 : 45 = 169
(x - 15) * 7 - 6 = 169 + 6
(x - 15) * 7 = 175
x - 15 = 175 : 7
x - 15 = 25
x = 25 + 15
x = 40
(y-18)x7-270:45=169
(y-18)x7-6=169
(y-18)x7=175
y-18=175:7
y-18=25
y=25+18
y=43
Vậy y=43
(y - 18) x 7 - 270 : 45 = 169
(y - 18) x 7 - 6 = 169
(y - 18) x 7 = 169 + 6
(y - 18) x 7 = 175
y - 18 = 175 : 7
y - 18 = 25
y - 18 = 25 + 18
y = 43
a) \(\frac{x-45}{55}+\frac{x-47}{53}=\frac{x-55}{45}+\frac{x-53}{47}\)
\(\Leftrightarrow\left(\frac{x-45}{55}-1\right)+\left(\frac{x-47}{53}-1\right)=\left(\frac{x-55}{45}-1\right)+\left(\frac{x-53}{47}-1\right)\)
\(\Leftrightarrow\frac{x-100}{55}+\frac{x-100}{53}=\frac{x-100}{45}+\frac{x-100}{47}\)
\(\Leftrightarrow\frac{x-100}{55}+\frac{x-100}{53}-\frac{x-100}{45}-\frac{x-100}{47}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\frac{1}{55}+\frac{1}{53}-\frac{1}{45}-\frac{1}{47}\right)=0\)
Vì \(\hept{\begin{cases}\frac{1}{55}< \frac{1}{45}\\\frac{1}{53}< \frac{1}{47}\end{cases}}\Rightarrow\frac{1}{55}+\frac{1}{53}-\frac{1}{45}-\frac{1}{47}< 0\)
\(\Rightarrow x-100=0\Rightarrow x=100\)
Vậy x = 100
\(\frac{x-17}{33}+\frac{169-x}{23}+\frac{x}{25}=4\)
\(\Rightarrow575.\left(x-17\right)+825.\left(169-x\right)+759x=75900\)
\(\Rightarrow575x-9775+139425-825x+759x-75900=0\)
\(\Rightarrow509x=-53750\)
\(\Rightarrow x=\frac{-53750}{509}\)
sử dụng tỉ lệ con nhà bà thức ta có (:|
\(\Leftrightarrow\frac{509x+129650}{18975}=\frac{4}{1}\Rightarrow\left(509x+129650\right)1=18975.4\)
\(\Rightarrow\frac{\left(509x+129650\right)1}{509x}=\frac{18975.4}{509x}\)
\(\Rightarrow\frac{509x+129650}{509x}=\frac{18975.4}{509x}\)
\(\Rightarrow x=-105,599214145383\)
Bài làm
\(\frac{x+19}{27}-\frac{x+17}{29}=\frac{x+15}{31}-\frac{x+13}{33}\)
\(\Leftrightarrow\left(\frac{x+19}{27}+1\right)-\left(\frac{x+17}{29}+1\right)=\left(\frac{x+15}{31}+1\right)-\left(\frac{x+13}{33}+1\right)\)
\(\Leftrightarrow\frac{x+46}{27}-\frac{x+46}{29}=\frac{x+46}{31}-\frac{x+46}{33}\)
\(\Leftrightarrow\left(x+46\right).\frac{1}{27}-\left(x+46\right).\frac{1}{29}=\left(x+46\right).\frac{1}{31}-\left(x+46\right).\frac{1}{33}\)
\(\Leftrightarrow\left(x+46\right).\frac{1}{27}-\left(x+46\right).\frac{1}{29}-\left(x+46\right).\frac{1}{31}+\left(x+46\right).\frac{1}{33}=0\)
\(\Leftrightarrow\left(x+46\right)\left(\frac{1}{27}-\frac{1}{29}-\frac{1}{31}\right)=0\)
Mà \(\left(\frac{1}{27}-\frac{1}{29}-\frac{1}{31}\right)>0\forall x\)
\(\Leftrightarrow x+46=0\)
\(\Leftrightarrow x=-46\)
Vậy phương trình trên có tập nghiệm S = { -46 }
# Học tốt #
\(\left(x-15\right)\cdot7-27:45=169\\ =>\left(x-15\right)\cdot7-\dfrac{3}{5}=169\\ =>\left(x-15\right)\cdot7=169+\dfrac{3}{5}\\ =>\left(x-15\right)\cdot7=\dfrac{848}{5}\\ =>x-15=\dfrac{848}{5}:7=\dfrac{848}{35}\\ =>x=\dfrac{848}{35}+15\\ =>x=\dfrac{1373}{35}\)