Giúp em ạ X1+x2=-4 X1x2=-2m-3 Giải vi-et 2x1³+5x1²x2+5x1x2²+2x2³=-284

Giúp em ạ 2x1³+5x1²x2+5x1x2²+2x2³=-284

Electricity is the most common form of energy today. In the modern world electricity is very available at the touch of a switch. Electricity has many uses. The most common use of electricity is to provide artificial lighting. In factories, electricity is used to light up the work place. It is also used to operate air-conditioners, computers and many others machines. Electricity is also used to power the many appliances that we have in our homes. Such appliances include television sets, computers, electric fans. Irons and many others. The list of simply endless. Modern man will most probably be lost without electricity. * True or false: 1. The passage is about a kind of energy..... 2. Electricity has a lot of uses. .... 3. Without electricity, our life will not be affected.... 4. The appliances that are depended on electricity are endless....

Cần gấp ạ! Cho mạch điện gồm: 1 cầu chì, 1 ổ cắm điện, và 2 công tắc 3 cực điều khiển 1 bóng đèn sợi đốt. a/ vẽ sơ đồ nguyên lí b/ vẽ sơ đồ lắp đặt