<u>а+b+2a+4b </u>= <u>3a+6b</u>=<u>3(a+2b)</u>=<u>a+2b</u><u>
</u><u /><u /> 15 15 15 5
<u>b+c-b+2c</u>=<u>3c</u>=<u>c</u>
3a 3a a
√(36×1,21)=6×1,1=6,6; √(3 6/25×2 2/49)=9/5 ×10/7 =18/7=2 4/7; √(15×10×6)=30; √2,7 × √120=18; √5 / √500 =1/√100 =1/10
4^х - 9 • 2^х + 8 = 0
2^2х - 9 • 2^х + 8 = 0
2^х = а ; а > 0
а^2 - 9а + 8 = 0
D = 81 - 32 = 49 = 7^2
a1 = ( 9 + 7 ) : 2 = 8
a2 = ( 9 - 7 ) : 2 = 1
1) 2 ^ x = 8
2 ^ X = 2 ^ 3
X = 3
2) 2 ^ x = 1
2 ^ X = 2 ^ 0
X = 0
Ответ 3 ; 0
Ответ:
a²-b²
2ab+a²-2ab-b²
2ab-²a²-2ab-b²=-a²-b²
a³+a²b+ab²-a²b -ab²-b³=a³-b³
a²+b²+ab-a²-b²+ab=2ab
a³+a²b-a²b-ab²+ab²+b³=a³+b³
2х - 4 = - 3
2х = 1
х = 0,5
Ответ ( 0,5 ; - 3 )