初一数学(需要完整全部步骤)谢谢
2个回答
2017-09-17 · 知道合伙人教育行家
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(a) 1/3÷(-12)÷2/9
=-1/3×1/12÷2/9
=-1/36×9/2
=-1/8
(b)(-4/3)÷(-7/9)×(-1又3/4)
=4/3×9/7×(-7/4)
=12/7×(-7/4)
=-3
(c) (+5)(+3)-(-9)(+2)
=15-(-18)
=15+18
=33
(d)(-121)÷(-11)+(-7.5)÷5
=11-1.5
=9.5
(e) (-6)÷(-2/3)+1/3×(-27)
=6×3/2-9
=9-9
=0
=-1/3×1/12÷2/9
=-1/36×9/2
=-1/8
(b)(-4/3)÷(-7/9)×(-1又3/4)
=4/3×9/7×(-7/4)
=12/7×(-7/4)
=-3
(c) (+5)(+3)-(-9)(+2)
=15-(-18)
=15+18
=33
(d)(-121)÷(-11)+(-7.5)÷5
=11-1.5
=9.5
(e) (-6)÷(-2/3)+1/3×(-27)
=6×3/2-9
=9-9
=0
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