(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法

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(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法(+3/4)*(-5

(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法
(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法

(+3/4)*(-5/7)*(-4)*(-1/5)有理数×法
(+3/4)*(-5/7)*(-4)*(-1/5)
=-(3/4)*4*[(5/7)*(1/5)]
=-3*(1/7)
=-3/7