作业帮(-31又3/4)×1又4/7+10又1/2×(-13又6/7)+(-21又1/4)×(-1又4/7)
来源：学生作业帮助网 编辑：作业帮 时间：2024/12/03 06:12:41
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(-31又3/4)×1又4/7+10又1/2×(-13又6/7)+(-21又1/4)×(-1又4/7)
(-31又3/4)×1又4/7+10又1/2×(-13又6/7)+(-21又1/4)×(-1又4/7)
(-31又3/4)×1又4/7+10又1/2×(-13又6/7)+(-21又1/4)×(-1又4/7)
(-31又3/4)×1又4/7+10又1/2×(-13又6/7)+(-21又1/4)×(-1又4/7)
=(-31又3/4+21又1/4)×1又4/7+10又1/2×(-13又6/7)
=-10又1/2×1又4/7+10又1/2×(-13又6/7)
=-10又1/2×(1又4/7+13又6/7)
=-10.5×15又3/7
=-162
(-31又3/4)×1又4/7+10又1/2×(-13又6/7)+(-21又1/4)×(-1又4/7)
=(-31又3/4)×1又4/7+(21又1/4)×(1又4/7)1+10又1/2×(-13又6/7)
=1又4/7*[(-31又3/4)+(21又1/4)]+10又1/2×(-13又6/7)
=1又4/7*(-10又1/2)+10又1/2×(-13又6/7)
=10又1/2×[(-1又4/7)+(-13又6/7)]
=21/2*(-108/7)
=-162