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a) \(38,7\times\left(38,7-x\right)=38,7\)
\(38,7-x=38,7:38,7\)
\(38,7-x=1\)
\(x=38,7-1\)
\(x=37,7\)
\(\left(\frac{3}{4}\times x-0,54\right):\frac{2}{9}=\frac{3}{4}-0,48\)
\(\left(\frac{3}{4}\times x-0,54\right):\frac{2}{9}=0,27\)
\(\left(\frac{3}{4}\times x-0,54\right)=0,27\times\frac{2}{9}\)
\(\left(\frac{3}{4}\times x-0,54\right)=0,06\)
\(\frac{3}{4}\times x=0,06+0,54\)
\(\frac{3}{4}\times x=0,6\)
\(x=0,6:\frac{3}{4}\)
\(x=0,8\)
(3/4 *x -0.54):2/9 = 3/4- 12/25
(3/4 *x- 27/50) :2/9 =27/100
3/4*x- 27/50 = 27/100* 2/9
3/4*x-27/50 = 3/50
3/4*x = 3/50+ 27/50
3/4*x =3/5
x= 3/5:3/4= 4/5
\(a,x.1,2+x.1,8=45\)
\(\Rightarrow x.\left(1,2+1,8\right)=45\)
\(x.3=45\)
\(x=45:3\)
\(x=15\)
a)13x3x32,27+67,63x39
=39x32,27+67,63x39
=39x(32,27+67,63)
=39x100
=3900
b,= 1- [ 1/2 x 1/3 x1/4 x..... x 1/100 ]
=1/2 x 2/3 x 3/4 x .......x 99/100
= 1x2x3x......x99 / 2x3x4x...... x100 [ rút gọn ]
= 1/100
\(\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{19.20}\right)\div x=\frac{9}{10}\)
\(\Rightarrow\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{19}-\frac{1}{20}\right)\div x=\frac{9}{10}\)
\(\Rightarrow\left(1-\frac{1}{20}\right)\div x=\frac{9}{10}\)
\(\Rightarrow\frac{19}{20}\div x=\frac{9}{10}\Rightarrow x=\frac{19}{20}\div\frac{9}{10}=\frac{19.10}{20.9}=\frac{19}{18}\)
Vậy x = 19/18
a, x + 1/2 = 3/2
x = 3/2 - 1/2
x = 1
b, x * 2 + x = 100 * 3
x * ( 2 + 1 ) = 300
x * 3 = 300
x = 300 : 3
x = 100
a)\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}......\frac{99}{100}\)
\(=\frac{1.2.3.4.....99}{2.3.4.5.6.....100}\)
\(=\frac{1}{100}\)
b) Tương tự như câu a
Mình giúp đc bn câu B nhé
b) X x 1,2 + X x 2,3 + 6,5 x X = 150
X x ( 1,2 + 2,3 + 6,5 ) = 150
X x 10 = 150
X = 150 : 10
X = 15
Câu A mk nghĩ ra rồi :
a ) X x 16,01- \(\frac{x}{100}\)= 76
X x ( 16,01 - 0,01 ) = 76
X x 16 = 76
X = 76 : 16
X = 4,75
Đúng thì k mk nhé
a) X = 1,1148;
b) X = 0,4