1 Avoid touching hot surfaces as they can burn you

2 Are bicycles a popular mode of transport in the countryside

1 Avoid touching hot surfaces as they can burn you

2 Are bicycles a popular mode of transport in the countryside

1 There are too many cars in some cities, and this causes air pollution

2 She is crazy about taking photographs of beautiful landscapes and scenery 

3 The river water is dirty enough to pose threat to aquatic life

1 I enjoy going to the park for a picnic for it allows me to relax in nature

2 We should go to this village in order to explore traditional ways of life

3 If we throw trash on the ground, the environment gets dirty

1 How much time do you spend playing video gé on weekends

2 Which family owns the largest field for planting crops in the rural area

1 I enjoy going to the park for a picnic for it allows me to relax in nature

2 We should go to this village in order to explore traditional ways of life

3 If we throw trash on the ground, the environment gets dirty

1 There are too many cars in some cities, and this causes air pollution

2 She is crazy about taking photographs of beautiful landscapes and scenery 

3 The river water is dirty enough to pose threat to aquatic life

1 Avoid touching hot surfaces as they can burn you

2 Are bicycles a popular mode of transport in the countryside

a, (x+y)² 

b, x²−25

b ,x²-5²

=x²−5² 

=(x−5)(x+5)

a) (x⁴ - 8x²y² + 12x⁵y) : (-4x²)

= 4x². (x² - 2y² + 3x³y) : x²

= - (x² - 2y²+ 3x³y)

= -x² + 2y² - 3x³y

b) x² - x²y - xy + x²y² - x³

= -x²y² - xy + x²y²

= -xy