Plus minus equals minus, but there are two situations, such as 7+(-4)=7-4=3, or 4+(-6)=4-6= -2. A positive number is equal to addition, for example, 2-(-3)=2+3=5, a positive number is multiplied by a negative number, and a positive number is divided by a negative number, for example, 6 × (-4) =-24,3 ÷ (-1) =-3. If the negative number comes first, then follow the example in the last three lines (-7)+4 = 4-. Or (-4)+6 = 6-4 = 2 (-2)-3 =-(2+3) =-2-3 =-5 (-6) × 4 =-24 (-3) ÷1=-3 If both are negative numbers, According to the above example, (-7)+(-4) =-7-4 =-(7+4) =-1or (-4)+(-6) =-(4+6) =-/.