(-5)x(-3 6/7)+(-7)x(-3 6/7)+12x(-3 6/7)要过程啊
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(-5)x(-3 6/7)+(-7)x(-3 6/7)+12x(-3 6/7)要过程啊
(-5)x(-3 6/7)+(-7)x(-3 6/7)+12x(-3 6/7)
要过程啊
(-5)x(-3 6/7)+(-7)x(-3 6/7)+12x(-3 6/7)要过程啊
=(-5-7+12)x(-36/7)
=0
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