1) (-11)² = 121
2) (-0,7)² = 0,49
3) (-2/5)² = 4/25
4) (-4)³ = -64
5) (-0,2)³ = -0,008
6) (-1/2)³ = -1/8
7) (-10)² + 97 = 100 + 97 = 197
8) (-0,9)² - 1 = 0,81 - 1 = -0,19
9) (-2/3)³ -1 = -8/27 - 1 = -1 8/27
(1/2)+(3/7)=(7/14)+(6/14)=13/14
(1/3)+(1/8)=(8/24)+(3/24)=11/24
(5/6)+(1/3)=(5/6)+(2/6)=7/6=1 1/6
(5/24)+(5/6)=(5/24)+(20/24)=25/24=1 1/24
(1/4)+(1/6)=(3/12)+(2/12)=5/12
(1/6)+(2/9)=(6/36)+(8/36)=14/36=7/18
А) О- 0 А- 4 В-6 С-8 D-12 б) О-0 К-4 N-10 T-18 L-22 в) O-0 E-30 F-60 T-80 K-100
<span>1) (1-7/10)х=2ц1/4,
Так как 1=10/10 и 10/10 - 7/10 = 3/10
(3/10)х=</span><span>2ц1/4,
х=</span><span><span>2ц1/4 : (3/10)
х=(9/4)·10/3
х=15/2
х=7,5
</span> 2) (1/4+1/5)х=1ц4/5,
((5/20)+(4/20))х=9/5
(9/20)х=9/5
х=(9/5):(9/20)
х=(9/5)·(20/9)
х=4
3) </span>(3ц1/8+1ц3/4)х=2ц1/6<span>
</span><span>(3ц1/8+1ц6/8)х=2ц1/6
(4ц7/8)х=2ц1/6
х=2ц1/6 : (4ц7/8)
х=(13/6):(39/8)
х=(13/6)·(8/39)
х=4/9
</span>4) (2ц1/12-1ц5/6)х=3/4
(2ц1/12-1ц10/12)х=3/4
(1ц13/12-1ц10/12)х=3/4
(3/12)х=3/4
х=(3/4): (3/12)
х=(3/4)·(12/3)
х=3