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2,5 x X < 10
X= 1 ; 2 ; 3
Vì 2,5 x 1 = 2,5 ; 2,5 x 2 = 5 ; 2,5 x 3 = 7,5 mà 2,5 ; 5 ; 7,5 đều < 10
a) x + 2,5 - 1,5 = 10 x 2
x + 2,5 - 1,5 = 20
x + 2,5 = 20 + 1,5
x + 2,5 = 21,5
x = 21,5 + 2,5
x = 24
b)x - 10 + 5 = 20 - 10
x - 10 + 5 = 10
x - 10 = 10 - 5
x - 10 = 5
x = 5 + 10
x = 15
Đề :
\(199,5:\frac{\frac{3}{5}\cdot x+4}{20}+8,5=\frac{242}{5}\)
\(\Rightarrow199,5:\frac{\frac{3}{5}\cdot x+4}{20}=\frac{242}{5}-8,5\)
\(\Rightarrow199,5:\frac{\frac{3}{5}\cdot x+4}{20}=48,4-8,5\)
\(\Rightarrow199,5:\frac{\frac{3}{5}\cdot x+4}{20}=39,9\)
\(\Rightarrow\frac{\frac{3}{5}\cdot x+4}{20}=199,5:39,9\)
\(\Rightarrow\frac{\frac{3}{5}\cdot x+4}{20}=5\)
\(\Rightarrow\frac{3}{5}\cdot x+4=5\cdot20\)
\(\Rightarrow\frac{3}{5}\cdot x+4=100\)
\(\Rightarrow\frac{3}{5}x=96\Leftrightarrow x=160\)
10- x=46,8:16,5*(2,32-0,48)
10-x=234/5:33/2*1,84
10-x=234/5*2/33*46/25
10-x=7176/1375
x=10-7176/1375
x=27500/2750-14352/2750
x=13148/2750
Vậy x=13148/2750
a) \(\frac{10}{11}\cdot4\frac{2}{5}\)
= \(\frac{10}{11}\cdot\frac{22}{5}\)
= \(\frac{5\cdot2}{11}\cdot\frac{11\cdot2}{5}\)
= 2 . 2
= 4
b) 2015 - \(\frac{4}{5}\)x 25%
= 2015 - \(\frac{4}{5}\)x \(\frac{1}{4}\)
= 2015 - \(\frac{1}{5}\)
= \(\frac{10074}{5}\)
a) \(15-3\left(x-1\right)-x=20\)
\(15-3x+3-x=20\)
\(-4x=2\)
\(x=-\frac{1}{2}\)
b) \(6x-2\left(x+3\right)=10\)
\(6x-2x-6=10\)
\(4x=16\)
\(x=4\)
c) \(25:\left(x+4\right)=5\)
\(x+4=25:5=5\)
\(x=1\)
d tự làm nha!
a) x=(0.24-0.002):0.34=\(\frac{7}{10}\)
b)x x 1.2=(13.7-0.02):4.06
x x 1.2=\(\frac{684}{203}\)
x=\(\frac{684}{203}\):1.2
x=\(\frac{570}{203}\)
12 k nha
x+10=20
x=20-10
x=10
\(x+10=20\)
\(x=20-10\)
\(x=10\)