3.y = 230×0.53+(400-230)×0.58+(x-400)0.83

(2) Solution: Let the electricity consumption this month be X degrees. Moreover, because the electricity consumption of 400 kWh is 230×0.53+(400-230)×0.58=220.5 yuan less than that of 262, the electricity consumption this month exceeds 400 kWh.

The column equation is: 230× 0.53+(400-230 )× 0.58+(x-400) 0.83 = 262.

Solution: x=450

A: A little.

I hope I can help you!