<span>9a²b² - 12ab³ = 3ab²(3a-4b)
20x³y² + 4x²y = 4x²y(5xy+1)
7a²bc + 14ab²c = 7abc(a+2b)
9xyz² - 12xy²z = 3xyz(3z-4y)
Вычислите:
137²+ 137 ·63 = 137·(137+63)=137·200= 27 400
187² - 187·87 = 187·(187 - 87) = 187 ·100 = 18 700
0,7³ + 0,7 · 9,51 = 0,7·(0,7²+9,51)=0,7·(0,49+9,51)=0,7·10=7
0,9³ - 0,81 · 2,9 = 0,81·(0,9-2,9)=0,81·(-2)=-1,62</span>
4-6(х+2)+3-5х=4-6х-12+3-5х=5-11х
-1-4(-7+8х)=-2х-6
-1+28-32х=-2х-6
-32х+2х=-6+1-28
-30х=-33
х=1,1
5(5+3х)-10х=8
25+15х-10х=8
5х=8-25
5х=-17
х=-3,4
-6=-9(7+х)+4х
-6=-63-9х+4х
9х-4х=-63+6
5х=-57
х=-11,4
8х+4(7+8х)=4х+7
8х+28+32х=4х+7
8х+32х-4х=7-28
36х=-21
х=-7/12