\(435-\left(x+16\right)=425:17\)              \(128xX-12xX-16xX=5208...">
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20 tháng 10 2017

a)435-(x+16)=425:17                                                                                     b)128.x-12.x-16x=5208000

=>435-(x+16)=25                                                                                           =>x.(128-12-16)=5208000     

=>x+16=435-25=410                                                                                      =>x.100=5208000  

x=410-16=394                                                                                                =>x=52080

Vậy ......                                                                                                        Vậy............

12 tháng 7 2016

1.Xx3,7+Xx6,3=120

Xx(3,7+6,3)=120

Xx10=120

X=120:10

X=12

2.128xX-12xX-16xX=5208000

(128-12-16)xX=5208000

100xX=5208000

X=5208000:100

X=52080

3.5xX+3,75xX+125xX=20

(5+3,75+125)xX=20

128,8xX=20

X=128,8:20

X=6,44

Câu cuối cùng cậu ghi sai rồi! 3,75xX+125xX nhé

21 tháng 6 2018

a)13x3x32,27+67,63x39

=39x32,27+67,63x39

=39x(32,27+67,63)

=39x100

=3900

21 tháng 6 2018

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

19 tháng 5 2018

Gợi ý: Các biểu thức mũ chẵn đều không âm.

\(a^{2n}+b^{2n}\le0\Leftrightarrow a^{2n}+b^{2n}=0\Leftrightarrow a=b=0\)

19 tháng 5 2018

a,\(\left(x-\frac{2}{5}\right)^{2010}+\left(y+\frac{3}{7}\right)^{468}\)< \(0\)

Vì \(\left(x-\frac{2}{5}\right)^{2010}\);\(\left(y+\frac{3}{7}\right)^{468}\)đều > \(0\)

=> \(\left(x-\frac{2}{5}\right)^{2010}=0\)

     \(\left(y+\frac{3}{7}\right)^{468}=0\)

=> \(\left(x-\frac{2}{5}\right)^{2010}=0^{2010}\)

     \(\left(y+\frac{3}{7}\right)^{468}=0^{468}\)

=> \(x-\frac{2}{5}=0\)

      \(y-\frac{3}{7}=0\)

=> \(x=\frac{2}{5}\)

      \(y=\frac{3}{7}\)

Vậy \(x=\frac{2}{5}\)\(y=\frac{3}{7}\)

6 tháng 8 2016

\(a,\left(16.23+16.77\right)-\left(5.30-5.20\right)\)

\(=16.\left(23+77\right)-5.\left(30-20\right)\)

\(=16.100-5.10\)

\(=1600-50\)

\(=1550\)

\(b,8\frac{1}{2}\div\frac{17}{5}+\frac{6}{8}\div3\frac{2}{3}\)

\(=\frac{17}{2}.\frac{5}{17}+\frac{3}{4}\div\frac{11}{3}\)

\(=\frac{17}{2}.\frac{5}{17}+\frac{3}{4}.\frac{3}{11}\)

\(=\frac{5}{2}+\frac{9}{44}\)

\(=\frac{110}{44}+\frac{9}{44}\)

\(=\frac{119}{44}\)

6 tháng 8 2016

\(a,=16.100-5.10=1600-50=1550\)

\(b,8\frac{1}{2}:\frac{17}{5}+\frac{6}{8}:3\frac{2}{3}=\frac{17}{2}.\frac{5}{17}+\frac{6}{8}:\frac{11}{3}=\frac{5}{2}+\frac{18}{88}=\frac{220}{88}+\frac{18}{88}=\frac{238}{88}=2\frac{31}{44}\)

27 tháng 2 2020

= 1 nhé mk nhầm

27 tháng 2 2020

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(\Rightarrow\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(\Rightarrow4x+\frac{15}{16}=1\)

\(\Rightarrow4x=\frac{1}{16}\)

\(\Rightarrow x=\frac{1}{64}\)

21 tháng 6 2018

x:6=24+6

x:6=30

x=30 x 6

x=180

23+x:2=37

x:2=37-23

x:2=14

x=14 x 2

x=28

214-136:x=197

136:x=214-197

136:x=17

x=136:17

x=8

(x-4):6:5=10

(x-4):6=10 x 5=50

(x-4)=50 x 6

x-4=300

x=300+4=304

(x+1)+(x+2)+...+(x+10)=755

10x + (1+2+...+10)=755

10x + (1+10) x [(10-1):1+1]:2=755

10x + 55 = 755

10x=755-55

10x=700

x=700:10=70

chúc bạn học tốt nha

\(\left(a\right)\frac{34-x}{30}=\frac{5}{6}\)

\(\frac{34-x}{30}=\frac{25}{30}\)

34 - x = 25

x = 34 - 25 = 9

\(\left(b\right)\frac{x+13}{34}=\frac{12}{17}\)

\(\frac{x+13}{34}=\frac{24}{34}\)

x + 13 = 24

x = 24 - 13 = 11

\(\left(c\right)\left(x+\frac{1}{3}\right)+\left(x+\frac{1}{9}\right)+\left(x+\frac{1}{27}\right)+\left(x+\frac{1}{81}\right)=\frac{56}{81}\)

\(4x+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}=\frac{56}{81}\)

Đặt \(A=\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}\)

Ta có : \(3A=1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}\)

\(3A-A=1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}-\frac{1}{3}-\frac{1}{9}-\frac{1}{27}-\frac{1}{81}\)

\(2A=1-\frac{1}{81}=\frac{80}{81}\)

\(A=\frac{80}{81}\div2=\frac{40}{81}\)

\(\Rightarrow4x+\frac{40}{81}=\frac{56}{81}\)

\(4x=\frac{56}{81}-\frac{40}{81}\)

\(4x=\frac{16}{81}\)

\(x=\frac{16}{81}\div4=\frac{4}{81}\)

9 tháng 8 2020

a, \(\frac{34-x}{30}=\frac{5}{6}\Leftrightarrow\frac{34-x}{30}=\frac{25}{30}\)

\(\Leftrightarrow34-x=25\Leftrightarrow x=9\)

b, \(\frac{x+13}{34}=\frac{12}{17}\Leftrightarrow\frac{x+13}{34}=\frac{24}{34}\)

\(\Leftrightarrow x+13=24\Leftrightarrow x=11\)