原式=(-35/3) x 2 +65/3 x2-31/3x2=2 x (-35/3+65/3-31/3) =2 x(-1/3) =-2/3
(﹣11又2/3)÷0.5-(﹣21又2/3)÷0.5-10又1/3÷0.5
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