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The answer to the sixth grade math summer homework (1)
Hehe, this is the application of one-dimensional linear equation in junior high school!

Solution: (1) Let the original sales price be X yuan per kWh,

According to the meaning: 40×(x+0.03)+60×(x-0.25)=42.73.

Solution: x=0.5653

∴ When x=0.5653, x+0.03 = 0.5953; x-0.25=0.3 153。

A: The electricity consumption of Xiaoming's home this month is 0.5953 yuan per kilowatt hour in the flat section and 0.3 153 yuan in the valley section.

(2) 100×0.5653-42.73= 13.8.

Answer: If the time-of-use electricity price is not used for settlement, Xiaoming's family will pay more in May 13.8 yuan.

Hope to be adopted!