(-5.25)x(-4.73)-4.73x(-19.75)-25x(-5.27)怎么求?

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(-5.25)x(-4.73)-4.73x(-19.75)-25x(-5.27)怎么求?

(-5.25)x(-4.73)-4.73x(-19.75)-25x(-5.27)怎么求?
(-5.25)x(-4.73)-4.73x(-19.75)-25x(-5.27)怎么求?

(-5.25)x(-4.73)-4.73x(-19.75)-25x(-5.27)怎么求?
(-5.25)*(-4.73)-4.73*(-19.75)-25*(-5.27)
=(-4.73)*[-5.25+(-19.75)]-25*(-5.27)
=(-4.73)*(-25)+(-25)*(-5.27)
=(-25)*(-10)
=250