计算(1)-2+1/3÷(-2) (2)(-3)²÷1/7×7(3)(-24)×(1/8-1/3+1/4)+(-2)³

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计算(1)-2+1/3÷(-2) (2)(-3)²÷1/7×7(3)(-24)×(1/8-1/3+1/4)+(-2)³
计算(1)-2+1/3÷(-2) (2)(-3)²÷1/7×7
(3)(-24)×(1/8-1/3+1/4)+(-2)³

计算(1)-2+1/3÷(-2) (2)(-3)²÷1/7×7(3)(-24)×(1/8-1/3+1/4)+(-2)³
(1)-2+1/3÷(-2)
=-2-1/6
=-2又1/6
(2)(-3)²÷1/7×7
=9÷1/7×7
=9×7×7
=441
(3)(-24)×(1/8-1/3+1/4)+(-2)³
=(-24)×(1/8-1/3+1/4)-8
=-24×1/8+24×1/3-24×1/4-8
=-3+8-6-8
=-9

(-24)×(1/8-1/3+1/4)+(-2)³= (-1) + (-8)=-9