2018 ACT Math Tests 1-17

The explanations of this book primarily use the logical steps to let users easily memorize the methods of solving questions. The essence of mathematics is logic. Human thinking naturally accepts the formula of "because" and "therefore". Hence, using mathematically logical steps to solve questions directly is in harmony with the natural function of human brain. Furthermore, it is helpful for memorizing because what you need to remember are the mathematically logical steps, which is refined a...