回答:
1.25^2019×(4/5)^2022×(-1)^2019
=1.25^2019×0.8^2022×(-1)
=(1.25×0.8)^2019×0.8^3×(-1)
=1×(-1)×0.8^3
=-64/125
运用了幂的乘法法则
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