как решить примеры 235-x меньше 229        48/aменьше 8     b+2 998 больше 3 004

масовая доля углерода равна 85,7% относительная плотность паров вещества по водороду равна 21. определите формулу вещества и назовите его.

 ПОМОГИТЕ!!!! в состав  алкана, плотность по воздуху корого равна 1,517 входит 18,18% водорода. Найдите молекулярную формулу кглеводорода, назовите формулу

Use the linkers in brackets to join the sentences. Leave out words where possible.

 1.On Saturdays my father goes to the gym. He sometimes goes to the swimming pool. (or)

 2.My sister is very musical – she plays the guitar. She also plays the piano. (and)

 3.I love fruit and vegetables. I don't like meat. (but)

 4.My mother does the housework in the morning. She goes to work in the afternoon. (and then)

 5.My friends come to my house and we play computer games. We sometimes watch a DVD. (or)

 6.I want to study English at university. My parents want me to study maths. (but)