(10%-7%)²×0.4+(5%-7%)²×0.6
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(10%-7%)²×0.4+(5%-7%)²×0.6=3%^2×0.4+2%^2×0.6=36/100000+24/100000=60/100000=0.0006
咨询记录 · 回答于2022-11-01
(10%-7%)²×0.4+(5%-7%)²×0.6
(10%-7%)²×0.4+(5%-7%)²×0.6=3%^2×0.4+2%^2×0.6=36/100000+24/100000=60/100000=0.0006
老师,为什么除以100000
3/100x3/100x4/10=36/100000
好的,谢谢老师
老师,5-7那不是负数吗
负数的平方等于正数
好的,明白了
谢谢
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