4a^2\(-a\2b)×(-b\8a)是4a^2÷(-a2b)×(-b\8a)
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4a^2\(-a\2b)×(-b\8a)是4a^2÷(-a2b)×(-b\8a)
4a^2\(-a\2b)×(-b\8a)
是4a^2÷(-a2b)×(-b\8a)
4a^2\(-a\2b)×(-b\8a)是4a^2÷(-a2b)×(-b\8a)
4a^2÷(-a^2b)×(-b\8a)
=4a^2 ×(-1/a^2b)×(-b/8a)
=1/2a