a) \(58.75+2.50.9-25.29=25.58.3+2.2.25.9-25.29=25\left(58.3+4.9-29\right)=25.181=4525\)b) \(3.9.39+3.9.63-2.27=27.39+27.63-27.2=27\left(39+63-2\right)=27.100=2700\)Chúc cậu học tốt!

\(A=8\cdot17\cdot125=\left(125\cdot8\right)\cdot17=1000\cdot17=17000\)

\(B=\left(25\cdot4\right)\cdot37=100\cdot37=3700\)

\(C=\left(75+50-25\right)\cdot58=100\cdot58=5800\)

\(D=\left(39+63-2\right)\cdot27=100\cdot27=2700\)

A=8.17.125= (8.125).17= 1000.17=17000

b=4.37.25=(4.25).37=100.37=3700

c= 58.75+58.50-58.25= 58.(75+50 - 25)= 58.100=5800

d=27.39+27.63-2.27= 27.(39+63-2)=27.100=2700

\(27\cdot39+27\cdot63-2\cdot27\)

\(=27\cdot\left(39+63-2\right)\)

\(=27\cdot100\)

\(=2700\)

27.39+27.63-2.27

=27.(39+63-2)

=27.100

=2700

27 . 39 + 27. 63 - 2 . 27

= 27 . (39 + 63 - 2 ) 

=27 . 100 = 2700

27.39 + 27.63 -2.27

= 27 . [ 39 + 63 - 2 ]

= 27 . 100

= 2700

Click mình mình click lại 3 cái !

27.39+27.63-2.27

= 27(39+63-2)

= 27. 100

= 2700

=2700

ta có

với x=0 pt trở thành \(8^0+18^0=2.27^0\Rightarrow1+1=2\left(ld\right)\)

\(f\left(x\right)=8^x+18^x\)

ta tính \(f'\left(x\right)=ln8.8^x+ln18.18^x>0\)

hàm số f(x) luôn đồng biến 

mặt khác \(y=2.27^x\)có \(y'=2.ln27.27^x>0\) hàm số y luôn đồng biến

suy ra nghiệm của pt x=0

Chia 2 vế cho \(27^x\) ta được:

\(3\left(\dfrac{8}{27}\right)^x+4\left(\dfrac{12}{27}\right)^x-\left(\dfrac{18}{27}\right)^x-2=0\)

\(\Leftrightarrow3\left(\dfrac{2}{3}\right)^{3x}+4\left(\dfrac{2}{3}\right)^{2x}-\left(\dfrac{2}{3}\right)^x-2=0\)

Đặt \(\left(\dfrac{2}{3}\right)^x=t>0\)

\(\Rightarrow3t^3+4t^2-t-2=0\)

\(\Leftrightarrow\left(t+1\right)^2\left(3t-2\right)=0\)

\(\Rightarrow t=\dfrac{2}{3}\Rightarrow\left(\dfrac{2}{3}\right)^x=\dfrac{2}{3}\)

\(\Rightarrow x=1\)

( 98 + 2 ) nhân 27

= 100 nhân 27 

= 2700

=27.(98+2)=27.100=2700

a)58.75+58.50-58.25

=58.(75+50-25)

=58.100

=5800

b)27.39+27.63-2.27

=27.(39+63-2)

=27.100

=2700

c)128.46+128.32+128.22

=128.(46+32+22)

=128.100

=12800

a) 58.75 + 58 . 50 - 58 . 25
= 58 . ( 75 + 50 - 25 )
= 58 . 100
= 5800
b) 27 . 39 + 27 . 63 - 2 . 27
= 27 . ( 39 + 63 - 2 )
= 27 . 100
= 2700
c) 128 . 46 + 128 . 32 + 128 . 22
= 128 . ( 46 + 32 + 22 )
= 128 . 100
= 12800