Задание 1 If you … more, you would be a lot healthier.
Варианты ответов:
1. exercised
2. exercise
3. had exercised
Задание 2
Plants die if you … them.
Варианты ответов:
1. don't water
2. won't water
Задание 3
If you … me, I would have helped you with the gardening.
Варианты ответов:
1. had asked
2. asked
3. would ask
4. ask
Задание 4
If you finish your housework, we … out.
Варианты ответов:
1. will go
2. go
3. would have gone
Задание 5
If I were you, I … the oven before you use it.
Варианты ответов:
1. would clean
2. would have cleaned
3. will clean
Задание 6
If she does her best at the interview, she ... get this job.
Варианты ответов:
1. will
2. would
Задание 7
If it ... rain, she will wash her car.
Варианты ответов:
1. doesn’t
2. didn't
3. hadn't
Задание 8
If we all ... bicycles, there wouldn’t be so much air pollution.
Варианты ответов:
1. used
2. didn't use
3. would use
Задание 9
If he had studied hard, he ... the exam.
Варианты ответов:
1. would have passed
2. would passed
3. would pass
4. would had passed
Задание 10
If I had known it was your birthday, I … you a present.
Варианты ответов:
1. would have bought
2. would bought
3. will buy
4. would buy
Задание 11
If he … to the party, he would have had a great time.
Варианты ответов:
1. had come
2. came
3. comes
Задание 12
If you ... hard, you'll get good grades.
Варианты ответов:
1. study
2. will study
3. studied
4. had studied
Задание 13
If I had a lot of money, I ... around the world.
Варианты ответов:
1. would travel
2. will travel
3. would have travelled
4. travelled
Задание 14
If we plant trees, forests disappear.
Варианты ответов:
1. won’t
2. wouldn't
3. don't
Задание 15
If you heat ice, it ... .
Варианты ответов:
1. melts
2. melt
3. will melt
Задание 16
If I see Peter, I … him to the party.
Варианты ответов:
1. will invite
2. invite
3. would invite
(6x-1)²-(3-8x)(3+8x)-(10x+1)²=0
(6x-1)²+(8x-3)(8x+3)-(10x+1)²=0
(36x²-12x+1)+(8x-3)(8x+3)-(100x²+20x+1)=0
(36x²-12x+1)+(64x²-9)-(100x²+20x+1)=0
36x²-12x+1+64x²-9-100x²-20x-1=0
-32x-9=0
-32x=9
32x=-9
x=(-9)÷32
x=-9/32
5(x+2)^2+(2x-1)^2-9(x+3)(x-3)=22
5(x+2)²+(2x-1)²-9(x+3)(x-3)-22=0
5(x²+4x+4)+(4x²-4x+1)-9(x+3)(x-3)-22=0
(5x²+20x+20)+(4x²-4x+1)-(9x+1)-(9x+27)(x-3)-22=0
(5x²+20x+20)+(4x²-4x+1)-(9x²-27x+27x-81)-22=0
(5x²+20x+20)+(4x²-4x+1)-(9x²-81)-22=0
5x²+20x+20+4x²-4x+1-9x²+81-22=0
16x+80=0
16x=-80
x=(-80)÷16
x=-5
x^2+y^2=17
5x-3y=17
y^2=17-x^2
5x=17-3y
y^2=17-x^2
x=(17-3y)/5
y^2=17-((17-3y)/5)^2
x=(17-3y)/5
Решаем второе уравнение силы:
17-(17-3y):2/25-у:2=0
(425-289+102у+9у^2-25у^2)/25=0 *25
16у^2+102y+136=0 /2
8y^2+51y+68=0
Д=b^2-4ac=51^2-4*8*68=2801-2176=625
y1=(-51+25)/16=-16/16=-1
y2=(-51-25)/16=-76/16=19/4=4.75
Возвращаемся в систему значений x и y( слева объедини квадратной скобкой, а все 3 строчки фигурной скобкой)
y1=-1
y2=-4.75
x1=(17+3)/5
x2=(17-3*4.75)/5
y1=-1
y2=-4.75
x1=4
x2=0.55