计算-xy-(4z-2xy)-(3xy-4z)

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计算-xy-(4z-2xy)-(3xy-4z)计算-xy-(4z-2xy)-(3xy-4z)计算-xy-(4z-2xy)-(3xy-4z)-xy-(4z-2xy)-(3xy-4z)=-xy-4z+2x

计算-xy-(4z-2xy)-(3xy-4z)
计算-xy-(4z-2xy)-(3xy-4z)

计算-xy-(4z-2xy)-(3xy-4z)
-xy-(4z-2xy)-(3xy-4z)
=-xy-4z+2xy-3xy+4z
=-2xy