Mathematics for IGCSE & O level - Equations (Section 4 - No. 4)
If two quantities A and B are equal, and two other quantities C and D are equal, then what is the consequence?
A + C = B + D
A - C = B - D
A * C = B * D
All of the above
Vysvětlení
If equals are added to equals, the sums are equal.