Гдз. 1. Запишите с помощью перечисления элементов, используя фигурные скобки, множество
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№ | y=–5 | y=–2 | y=2,5 | |
а) | 20–5(–5)>20+5(–5) | 20–5(–2)>20+5(–2) | 20–5 ∙ 2,5<20+5 ∙ 2,5 | |
б) | (–5)2–2(–5)=(–5)((–5)–2) | (–2)2–2(–2)=(–2)((–2)–2) | 2,52–2∙2,5=2,5(2,5–2) | |
в) | > | > | > | |
г) | < | < | (нет смысла) | |
б.1. ∙ = =6,25 в.1. =15; | в.2. = = ∙ = ∙ = г.1. =– =–1,6; =– =–0,6 |
№84. 0,85a | №85. 0,8b | №86. 15x – 2y | №87. b+3 |
№88.
а) 0,5∙0,4+0,6∙0,25= =0.35 а.1. + = =0.35 | б) 0,5∙(– )+0,6∙1 =0.55 б.1. ∙(– )= – =–0.25 | б.2. ∙ = =0.8 |
№89. а) (3(–1.5)–5)(–0.9)= –9.5∙ (–0.9) =8.55 а.1. ∙(– ) = ∙ = =8.55 | б) ( )2–3 ∙ ∙ =–0.125 б.1. 3 ∙ ∙ = б.2. – =– =–0.125 | в) 5(-2)+40=30 г) ∙ – ∙ = – =– |
№90.
a/b | –3 | –2 | –1 | 0 | 1 | 2 | 3 |
–3 | 0 | 1 | 4 | 9 | 16 | 25 | 36 |
–2 | 1 | 0 | 1 | 4 | 9 | 16 | 25 |
–1 | 4 | 1 | 0 | 1 | 4 | 9 | 16 |
0 | 9 | 4 | 1 | 0 | 1 | 4 | 9 |
1 | 16 | 9 | 4 | 1 | 0 | 1 | 4 |
2 | 25 | 16 | 9 | 4 | 1 | 0 | 1 |
3 | 36 | 25 | 16 | 9 | 4 | 1 | 0 |
а) a2–2ab+b2
(–3)2–2(–3)∙(–3)+(–3)2=9–18+9=0 (–3)2–2(–3)∙(–2)+(–2)2=9–12+4=1 (–3)2–2(–3)∙(–1)+(–1)2=9–6+1=4 (–3)2–2(–3)∙(1)+(1)2=9+6+1=16 (–3)2–2(–3)∙(2)+(2)2=9+12+4=25 (–3)2–2(–3)∙(3)+(3)2=9+18+9=36 | (–2)2–2(–2)∙(–3)+(–3)2=4–12+9=1 (–2)2–2(–2)∙(–2)+(–2)2=4–8+4=0 (–2)2–2(–2)∙(–1)+(–1)2=4–4+1=1 (–2)2–2(–2)∙(1)+(1)2=4+4+1=9 (–2)2–2(–2)∙(2)+(2)2=4+8+4=16 (–2)2–2(–2)∙(3)+(3)2=4+12+9=25 |
(–1)2–2(–1)∙(–3)+(–3)2=1–6+9=4 (–1)2–2(–1)∙(–2)+(–2)2=1–4+4=1 (–1)2–2(–1)∙(–1)+(–1)2=1–2+1=0 (–1)2–2(–1)∙(1)+(1)2=1+2+1=4 (–1)2–2(–1)∙(2)+(2)2=1+4+4=9 (–1)2–2(–1)∙(3)+(3)2=1+6+9=16 | (1)2–2(1)∙(–3)+(–3)2=1+6+9=16 (1)2–2(1)∙(–2)+(–2)2=1+4+4=9 (1)2–2(1)∙(–1)+(–1)2=1+2+1=4 (1)2–2(1)∙(1)+(1)2=1–2+1=0 (1)2–2(1)∙(2)+(2)2=1–4+4=1 1)2–2(1)∙(3)+(3)2=1–6+9=4 |
(2)2–2(2)∙(–3)+(–3)2=4+12+9=25 (2)2–2(2)∙(–2)+(–2)2=4+8+4=16 (2)2–2(2)∙(–1)+(–1)2=4+4+1=9 (2)2–2(2)∙(1)+(1)2=4–4+1=1 (2)2–2(2)∙(2)+(2)2=4–8+4=0 (2)2–2(2)∙(3)+(3)2=4–12+9=1 | (3)2–2(3)∙(–3)+(–3)2=9+ (3)2–2(3)∙(–2)+(–2)2=9+ (3)2–2(3)∙(–1)+(–1)2=9+ (3)2–2(3)∙(1)+(1)2=9– (3)2–2(3)∙(2)+(2)2=9– (3)2–2(3)∙(3)+(3)2=9– |
a/b | –3 | –2 | –1 | 0 | 1 | 2 | 3 |
–3 | 36 | 25 | 16 | 9 | 4 | 1 | 0 |
–2 | 25 | 16 | 9 | 4 | 1 | 0 | 1 |
–1 | 16 | 9 | 4 | 1 | 0 | 1 | 4 |
0 | 9 | 4 | 1 | 0 | 1 | 4 | 9 |
1 | 4 | 1 | 0 | 1 | 4 | 9 | 16 |
2 | 1 | 0 | 1 | 4 | 9 | 16 | 25 |
3 | 0 | 1 | 4 | 9 | 16 | 25 | 36 |
(a+b)2
№91.
372=1369 | (–39)2=1521 | 4,32=18,49 | (–8,1)2=65,61 |
№92.
а) 3(a–b)=3∙1,2=3,6 | б) b–a=–1,2 | в) 10 | г) –5 |
№93.
а) = | б) – =–2 | в) 3+ = =4 | г) = |
№94. S=ab–0.5a(a–2b) | №96. а) 100x+10y+z б) 100a+b в) 1000a+100b+10c+d г) |
№97.
а) (10a+b)–(10b+a)=36 9а–9b=36 9(а–b)=36 а–b=4 а=4+ b а∈N; b∈N b=1; a=5 b=2; a=6 b=3; a=7 b=4; a=8 b=5; a=9 {51; 62; 73; 84; 95} | б) (10a+b)+(10b+a)=22 11а–11b=22 11(а–b)=22 а–b=2 а=2+ b а∈N; b∈N b=1; a=3 b=2; a=4 b=3; a=5 b=4; a=6 b=5; a=7 b=6; a=8 b=7; a=9 {31; 42; 53; 64; 75; 86; 97} |
№98.
а) 3n | б) 5n | в) 11n | г) 4n+2 | д) 5n+4 | е) 2n+1 |
№99.
а) 14–n {2; 4; 6; 8; 10; 12; 14} | б) 14–n {1; 3; 5; 7; 9; 11;13} | в) 14–n {1; 3; 7; 9; 11; 12} | в) 14–n {4; 9} |
№100.
а) {3; 5; 7; 9; 11; 13; 15} | б) {2; 5; 8; 11; 14; 17; 20; 23; 26} | в) {15; 25; 35; 45; 55; 65} | г) {14; 31; 48; 65; 82} |
№101.
а) 6n–1 | б) 10n–1 | в) 20–3n | г) |
№102.
а) | x=8 | x=0 | x=–2 |
5x+2 ? 10x | 42<80 | 2>0 | –8>–20 |
б) | x=1 | x=0 | x=–4 |
3х–5 ? х | –2<1 | –5<0 | –11<–2 |
№103.
a) a>0 | б) b<0 | в) x≥0 | г) y≤0 |
№104.
a) 0< a<10 | б) –5< a<0 | в) 0≤с<1 | г) –7<с≤0 |
№109.
а) ∙ + ∙ = + = =7 б) ∙ = =40 | в) ∙ = ; 0,09+1,01=1,1 г) ∙ = ; – = ; ∙ = ; – = =0,25 |
№110.
0.3636; 0,375; 0,38; 0,3846 ; 0.428
№111.
(2∙4.5+3)÷(1+2)=4
№112.
100/25+6=10
Контр. вопросы:
3.
a=–2 | a=1.2 | a=4 |
a+6>6a | a+6=6a | a+6<6a |
4.
(x+y)∙(x–y)
5.
7n; 3n+1
№113.
а) (3n)2={6; 12; 18; 24}
б) (5n)2={10; 20}
в) 2n или 3n={2; 4; 6; 8; 10; 12; 14; 16; 18; 20; 22; 24; 26; 28; 3; 9; 15; 21; 27}
г) 2n или 5n={2; 4; 6; 8; 10; 12; 14; 16; 18; 20; 22; 24; 26; 28; 5; 15; 25}
№115.
а) {113; 131; 311; 221; 122; 212; 410; 401; 104; 140;}
б) {123; 132; 312; 321; 213; 231; 611; 161; 116}
№116.
а) { ; ; ; ; ; ; ; ; } | б) { ; ; ; ; } | в) { ; ; ; ; ; ; ; } |