\(x=\)\(\frac{-30}{11}nha\)\(bạn\)\(!!!!!!!!\)

\(tk\)\(mik\)\(nha\)\(!!!!!!!!!!!!!\)

(6x5:X)+15=4

30:X=4-15=-11

=>X=30:(-11)=-\(\frac{30}{11}\)

hihi, chúc bn hk tốt nha >,<

+) 5²³ - 6x5²² = 5²²(5-6) = -5²² < 0

=> 5²³ < 6x5²²

+) 7x2¹³ - 2¹⁶ = 2¹³(7-2³)= -2¹³ < 0

=> 7x2¹³ < 2¹⁶

+) 21¹⁵ = 7¹⁵x3¹⁵ ; 27⁵x49⁸ = 3¹⁵x7¹⁶

=> 7¹⁵x3¹⁵ - 3¹⁵ x 7¹⁶ = 3¹⁵ x 7¹⁵ (1-7) = -6x 3¹⁵ x 7¹⁵ < 0

=> 21¹⁵ < 27⁵x 49⁸

\(\text{5^2: 5 + (116 +72: 36): 4}\\ =5+\left(116+2\right):4\\=5+118:4 \\ =5+29,5=34,5\)

1, 5^2:5+(116+72:36):4

=5+118:4

=5+7.375=12.375

2,=100:(250:-20)

=100:-12,5

=-8

(bài dễ bome:333

\(100:\left\{250:\left[450-\left(4.5^3-6.5\right)\right]\right\}\\ =100:250:\left[450-\left(500-30\right)\right]\\ =100:250:\left[450-470\right]\\ =0,4:-20\\ =-0,02\)

=(30+7-37)x(1+2+3+4+5+6+7+8+9+10)

=(37-37)x(1+2+3+4+5+6+7+8+9+10)

=0x(1+2+3+4+5+6+7+8+9+10)

=0

0  đúng đó tich nha

( 6 x 5 + 7 - 37 ) x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= ( 30 + 7 - 37 ) x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= ( 37 - 37 ) x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= 0 x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= 0

6*5+7-37= 0  vì 0 nhân số nào cũng =0 nên đáp án = 0

a) \(5^{3n+2}=25^{n+3}\)

\(\Leftrightarrow5^{3n+2}=5^{2\left(n+3\right)}\)

\(\Leftrightarrow3n+2=2\left(n+3\right)\)

\(\Leftrightarrow3n+2=2n+6\)

\(\Leftrightarrow n=4\)

b) \(6.5^{n-2}+10^2=2.5^3\left(n>1\right)\)

\(\Leftrightarrow6.5^{n-2}=2.5^3-10^2\)

\(\Leftrightarrow6.5^{n-2}=2.5^3-2^2.5^2\)

\(\Leftrightarrow6.5^{n-2}=2.5^2\left(5-2\right)\)

\(\Leftrightarrow6.5^{n-2}=2.5^2.3\)

\(\Leftrightarrow5^{n-2}=5^2\)

\(\Leftrightarrow n-2=2\)

\(\Leftrightarrow n=4\)

=(30+7-37)*(1+2+3+4+5+6+7+8+9+10)

=0*(1+2+3+4+5+6+7+8+9+10)

=0

( 6 x 5  + 7 - 37)x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 +9 + 10)

0 x 55 = 0

So sách 

f,5^23 và 6x5^22

g. 7x2^13 và 2^10

Giải :

 f)  Vì 5²³ = 5 . 5²²

ta lại có : 5 < 6

=> 5.5²² < 6.5²²

=> 5²³ < 6.5²²

g) Vì 2¹⁰⁰ = ( 2⁴ . 2  )²⁰ = 16 . 2²⁰

Ta lại có :   7 < 16

                2¹³ < 2¹⁰

=> 7.2¹³ < 16.2¹⁰⁰

=> 7 .2¹³ < 2¹⁰⁰

\(5^{23}=5^{22}\cdot5\)

\(6\cdot5^{22}\)

Ta thấy 6>5\(\Leftrightarrow6\cdot5^{22}>5\cdot5^{22}\Leftrightarrow6\cdot5^{22}>5^{23}\)

\(2^{100}=2^{13}\cdot2^{87}=2^{13}\cdot8\cdot2^{84}\)

Ta thấy 8>7\(\Rightarrow8\cdot2^{13}>7\cdot2^{13}\Rightarrow8\cdot2^{13}\cdot2^{84}>7\cdot2^{13}\)

\(\Leftrightarrow2^{100}>7\cdot2^{13}\)

rút gọn biểu thức nha cb