(4/7-1又1/8+3/14)*56
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(4/7-1又1/8+3/14)*56
(4/7-1又1/8+3/14)*56
(4/7-1又1/8+3/14)*56
(4/7-1又1/8+3/14)*56
=4/7*56-1又1/8*56+3/14*56
=32-63+12
=44-63
=-19
(4/7-1又1/8+3/14)*56
(4/7-1又1/8+3/14)*56
(4/7-1又1/8+3/14)*56
(4/7-1又1/8+3/14)*56
=4/7*56-1又1/8*56+3/14*56
=32-63+12
=44-63
=-19