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\(\Rightarrow10\times x-\left(1+2+...+10\right)=15\times100+75\\ \Rightarrow10\times x-55=1500+75=1575\\ \Rightarrow10\times x=1575+55=1630\\ \Rightarrow x=1630:10=163\)
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Ta có :
(x + 1) + (x + 2) + (x + 3) + (x + 4) + (x + 5) + (x + 6) = 75
=) 6x + ( 1 + .... + 6 ) = 75
=) 6x + [ ( 1 + 6 ) x 6 / 2 ] = 75
=) 6x + 21 = 75
=) 6x = 75 - 21
=) 6x = 54
=) x = 54 : 6
=) x = 9
Mình nhanh nhất nha
x+1+x+2+x+3+x+4+x+5+x+6=75
x.6+(1+2+3+4+5+6)=75
x.6+21=75
x.6=75-21=54
x=54:6=9
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a) 720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 ) = 720 : 6
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 120 : 5
x = 24
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\((\)125-120\()\)x45
5x45=225
\(\dfrac{30x25x7x8}{75x8x12x14}\)=\(\dfrac{10\cdot1\cdot7\cdot1}{1\cdot1\cdot1\cdot12\cdot2}\)=\(\dfrac{70}{24}\)
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a) (x + 729) x 38 = 54226
x + 729 = 54226 : 38
x + 729 = 1427
x = 1427 - 729
x = 698
b) (1862 - x) x 26 = 38714
1862 - x = 38714 : 26
1862 - x = 1489
x = 1862 - 1489
x = 373
c) 49203 : (x - 47) = 63
x - 47 = 49203 : 63
x - 47 = 781
x = 781 + 47
x = 828
d) 10266 - (x + 75) = 29
x + 75 = 10266 - 29
x + 75 = 10237
x = 10237 - 75
x = 10162
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a) \(\dfrac{1}{2}+x=\dfrac{5}{6}\)
\(\Rightarrow x=\dfrac{5}{6}-\dfrac{1}{2}=\dfrac{5}{6}-\dfrac{3}{6}=\dfrac{2}{6}=\dfrac{1}{3}\)
b) \(x+\dfrac{1}{4}=\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{3}{4}-\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)
c) \(x-\dfrac{1}{5}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}+\dfrac{1}{5}=\dfrac{3}{10}+\dfrac{2}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
d) \(\dfrac{5}{6}-x=\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{5}{6}-\dfrac{1}{3}=\dfrac{5}{6}-\dfrac{2}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)
e) \(\dfrac{3}{10}+x=\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{1}{2}-\dfrac{3}{10}=\dfrac{5}{10}-\dfrac{3}{10}=\dfrac{2}{10}=\dfrac{1}{5}\)
g) \(x+\dfrac{1}{4}=\dfrac{3}{8}\)
\(\Rightarrow x=\dfrac{3}{8}-\dfrac{1}{4}=\dfrac{3}{8}-\dfrac{2}{8}=\dfrac{1}{8}\)
a) 12+x=5612+x=56
⇒x=56−12=56−36=26=13⇒x=56−12=56−36=26=13
b) x+14=34x+14=34
⇒x=34−14=24=12⇒x=34−14=24=12
c) x−15=310x−15=310
⇒x=310+15=310+210=510=12⇒x=310+15=310+210=510=12
d) 56−x=1356−x=13
⇒x=56−13=56−26=36=12⇒x=56−13=56−26=36=12
e) 310+x=12310+x=12
⇒x=12−310=510−310=210=15⇒x=12−310=510−310=210=15
g) x+14=38x+14=38
⇒x=38−14=38−28=18⇒x=38−14=38−28=18
Đọc tiếp
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Trên tia õ lấy 2 điểm C,D sao cho OC=6cm , OD=2cm
Gọi M là trung điểm của đạn thẳng CD .Tính độ dài các đoạn thẳng MD,MC,OM
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Bài 1:
a: x+1/2=5/6
nên x=5/6-1/2=1/3
b: x+1/4=3/4
nên x=3/4-1/4=2/4=1/2
c: x+3/10=1/2
nên x=1/2-3/10=5/10-3/10=1/5
d: x+1/4=3/8
nên x=3/8-1/4=3/8-2/8=1/8
\(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)+...+\left(x-10\right)=15\times25\times4+75\)
\(x-1+x-2+x-3+...+x-10=15\times\left(25\times4\right)+75\)
\(\left(x+x+x+...+x\right)-\left(1+2+3+...+10\right)=15\times100+75\)
\(10x-55=1500+75\)
\(10x-55=1575\)
\(10x=1575+55\)
\(10x=1630\)
\(x=1630:10\)
\(x=163\)