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“十字交叉法”又名“交叉法”、“混合规则法”、“杠杆原理法”。它在一些化学计算中能简化计算过程，提高解题速度，因而被广泛应用。一、方法推导“十字交叉法”的计算式可用不同质量分数的同种溶质的两种溶液的混合为例加以推导。设浓溶液的质量为wA，溶质的质量分数为。?
The “Crossing Method” is also known as the “crossing method”, “mixed rule method”, and “lever principle method.” It can be widely used in some chemical calculations because it can simplify the calculation process and increase the speed of problem solving. First, the method derivation The calculation formula of the “Cross Cross Method” can be deduced using the mixture of two solutions of the same kind of solute with different mass fractions as an example. Let the mass of the concentrated solution be wA and the mass fraction of the solute be. ?