請問一下 (-3)^2 + (-4)^2 ÷ (-2/5)^2 答案為什麼是-91呢??? P.s.需附計算過程?

2018-11-29 8:06 pm

回答 (2)

2018-11-30 12:38 pm
請問一下(-3)^2+(-4)^2÷(-2/5)^2答案為什麼是-91呢?
Sol
(-3)^2+(-4)^2/(-2/5)^2
=(-3)*(-3)+(-4)*(-4)/[(-2/5)*(-2/5)]
=9+16/(4/25)
=9+16*(25/4)
=9+100
=109
題目改為
請問一下(-3)^2-(-4)^2÷(-2/5)^2答案為什麼是-91呢?
Sol
(-3)^2-(-4)^2/(-2/5)^2
=(-3)*(-3)-(-4)*(-4)/[(-2/5)*(-2/5)]
=9-16/(4/25)
=9-16*(25/4)
=9-100
=-91
2018-12-30 12:18 am
9+16/(4/25)=109才對喔


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