Current location - Training Enrollment Network - Mathematics courses - Century problem, seek detailed explanation. Mathematically, why is subtracting a negative number equal to adding its inverse (how to get it)?
Century problem, seek detailed explanation. Mathematically, why is subtracting a negative number equal to adding its inverse (how to get it)?
Because the reciprocal of a negative number (for example, -2) is a positive number (+2), for example, 5 MINUS -2 is 5-(-2), and removing the brackets gives 5+2=7.
If represented by the number axis, point A is 5 squares to the right of the origin of 0, minus -2, which is equivalent to moving the origin of O to the left by 2 units, and at this time A=7.