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a,x : 4 + x x 0,25 = 2,45
x x 1/4 + x x 1/4 = 2,45
x x (1/4 x2)=2,45
x x 1/2=2,45
x=2,45:1/2
x=4,9
b,x : 42=38,3+52
x :42=90,3
x=90,3 x 42
x = 3792,6
câu cuối sai đề bạn nhé
a,x : 4 + x x 0,25 = 2,45
x x 1/4 + x x 1/4 = 2,45
x x (1/4 x2)=2,45
x x 1/2=2,45
x=2,45:1/2
x=4,9
b,x : 42=38,3+52
x :42=90,3
x=90,3 x 42
x = 3792,6
câu cuối sai đề bạn nhé
Ta có: 11,3xX + 9,7x0,01 = 11,397
11,3xX + 0,097 = 11,397
11,3xX = 11,397 - 0,097= 11,3
X = 11,3 : 11,3= 1
Ta có: 11,3xX + 9,7x0,01 = 11,397
11,3xX + 0,097 = 11,397
11,3xX = 11,397 ‐ 0,097= 11,3
X = 11,3 : 11,3= 1
3,3 × 32,96 + 1,1 × 28,74 × 3 + 6,6 × 38,3 : 2
= 3,3 × 32,96 + 3,3 × 28,74 + 3,3 × 38,3
= 3,3 × (32,96 + 28,74 - 38,3)
= 3,3 × 100
= 330
a, Ta có:
5X + 4.5 = 4.5
=> X = 0
b,
a + a + ... + a = 99
=> 99a = 99
=> a = 1
\(a̸\)
\(\frac{3}{5}-\frac{1}{2}.x=\frac{1}{4}\)
\(\frac{1}{2}.x=\frac{3}{5}-\frac{1}{4}\)
\(\frac{1}{2}.x=\frac{7}{20}\)
\(\Rightarrow\frac{7}{10}\)
\(b̸\)
\(11,3+2\left[x-\frac{1}{3}\right]=\frac{25}{6}\)
\(2\left[x-\frac{1}{3}\right]=\frac{25}{6}-11,3\)
\(2\left[x-\frac{1}{3}\right]=\frac{-107}{15}\)
\(x-\frac{1}{3}=\frac{-107}{15}:2\)
\(x-\frac{1}{3}=\frac{-107}{30}\)
\(x=\frac{-107}{30}+\frac{1}{3}\)
\(x=\frac{-97}{30}\)
\(a)\frac{3}{5}-\frac{1}{2}x=\frac{1}{4}\)
\(\implies\frac{1}{2}x=\frac{3}{5}-\frac{1}{4}\)
\(\implies\frac{1}{2}x=\frac{7}{20}\)
\(\implies x=\frac{7}{20}:\frac{1}{2}\)
\(\implies x=\frac{7}{10}\)
Vậy...
\(b) 11,3+2(x-\frac{1}{3})=\frac{25}{6}\)
\(\implies \frac{113}{10}+2x-2.\frac{1}{3}=\frac{25}{6}\)
\(\implies \frac{113}{10}+2x-\frac{2}{3}=\frac{25}{6}\)
\(\implies \frac{113}{10}+2x=\frac{25}{6}+\frac{2}{3}\)
\(\implies \frac{113}{10}+2x=\frac{29}{6}\)
\(\implies 2x=\frac{29}{6}-\frac{113}{10}\)
\(\implies 2x=\frac{-97}{15}\)
\(\implies x=\frac{-97}{30}\)
Vậy..
\(c)5x-435+2x+140+3x=565\)
\(\implies (5x+2x+3x)+(-435+140)=565\)
\(\implies 10x+(-295)=565\)
\(\implies 10x=565-(-295)\)
\(\implies 10x=860\)
\(\implies x=86\)
Vậy...
~ hok tốt a~
=>4,5x=27
hay x=6