a) \(\frac{9}{18}--\frac{7}{12}+\frac{13}{32}=\frac{9}{18}+\frac{7}{12}+\frac{13}{32}=\frac{144}{288}+\frac{168}{288}+\frac{117}{288}=\frac{143}{76}\)

​​​​b) \(\frac{5}{-8}\times\frac{14}{23}-\frac{6}{10}=\frac{-35}{92}-\frac{6}{10}=\frac{-175}{460}-\frac{276}{460}=\frac{-451}{460}\)
k đúng cho mình nha
 

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150000000000

sai rồi
 

x(x+1)=72

mà x(x+1) là hai số tự nhiên liên tiếp nên x=8

vậy x=8

ket qua x = 8 ban nha

x(x+1)=4.18

xx+x.1=72(biến đổi theo t/c phân phối phép nhân với phép cộng)

x²+x=72

x=8

Vậy x=8 

100

k mik nha

 45⁴x40⁴x18²/180⁶

=45⁴x40⁴x18²/18⁶x10⁶

=45⁴x40⁴/18⁴x10⁶

=45⁴x10⁴x4⁴/18⁴x10⁶

=45⁴x4⁴/18⁴x10²

=15⁴x3⁴x2²x2²/6⁴x3⁴x5²x2²

=15⁴x1x1x2²/6⁴x1x5²x1

=15⁴x2²/6⁴x5²

=5⁴x3⁴x2²/3⁴x2⁴x5²

=5²x1x1/1x2²x1

=5²/2²=25/4

a: \(=\dfrac{2^{12}\cdot3^{14}}{3^{12}\cdot2^{12}}=3^2=9\)

b: \(=\dfrac{7^3\cdot2\cdot5^3}{5^2\cdot7^2\cdot6}=7\cdot5\cdot\dfrac{1}{3}=\dfrac{35}{3}\)

d: =2^5(2^8+1)/2^2(2^8+1)=2^3=8

c: \(=\dfrac{5^3\cdot3^6\cdot2^8\cdot5^4\cdot3^4\cdot2^2}{2^{10}\cdot3^{10}\cdot5^5}=5^2\)

2^2.5^4.2^12.5^4.2^2.3^4/2^12.5^6.3^12=2^16.5^8.3^4/2^12.5^6.3^12=2^4.5^2/3^8=........

=0 nha !

nhớ tích cho mìn nhe!

= 0 nha

k cho mik nhé

a) \(\dfrac{-5}{11}+\left(\dfrac{-6}{11}+1\right)\)

\(=\dfrac{-5}{11}+\left(\dfrac{-6}{11}+\dfrac{11}{11}\right)\)

\(=\dfrac{-5}{11}+\dfrac{5}{11}\)

\(=0\)

b) \(\dfrac{2}{3}+\left(\dfrac{5}{7}+\dfrac{-2}{3}\right)\)

\(=\dfrac{2}{3}+\dfrac{-2}{3}+\dfrac{5}{7}\)

\(=0+\dfrac{5}{7}\)

\(=\dfrac{5}{7}\)

c) \(\left(\dfrac{-1}{4}+\dfrac{5}{8}\right)+\dfrac{-3}{8}\)

\(=\dfrac{-1}{4}+\dfrac{-3}{8}+\dfrac{5}{8}\)

\(=\dfrac{-2}{8}+\dfrac{-3}{8}+\dfrac{5}{8}\)

\(=0\)

d) \(\dfrac{3}{4}.\dfrac{7}{25}+\dfrac{3}{4}.\dfrac{18}{25}\)

\(=\dfrac{3}{4}.\left(\dfrac{7}{25}+\dfrac{18}{25}\right)\)

\(=\dfrac{3}{4}.1\)

\(=\dfrac{3}{4}\)

Chúc bạn học tốt