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(-3/5)x(-3又1/2)÷(-1又1/4)÷3
=-(3/5×1/3)×(7/2×5/4)
=-1/5×35/8
=-7/8
(-49)÷(-2又1/3)÷7/3除以(-3)
=-49×3/7×3/7×1/3
=-21×3/7×1/3
=-9×1/3
=-3
=-(3/5×1/3)×(7/2×5/4)
=-1/5×35/8
=-7/8
(-49)÷(-2又1/3)÷7/3除以(-3)
=-49×3/7×3/7×1/3
=-21×3/7×1/3
=-9×1/3
=-3
追问
那(-217又7/9)-(-7)和-22/7x(7/22-4/3)x7/22÷(-22/21)呢?不会亏待你的!
追答
(-217又7/9)-(-7)
=-217又7/9+7
=-210又7/9
-22/7x(7/22-4/3)x7/22÷(-21/22)
=-22/7x7/22×(7/22-4/3)÷(-21/22)
=67/22×22/21
=67/21
2012-09-25
展开全部
(-3/5)x(-3又1/2)÷(-1又1/4)÷3
=(-3/5)x(-7/2)÷(-5/4)÷3
= - 3/5 x 7/2 x 4/5 x 1/3
= - 14/25
(-49)÷(-2又1/3)÷7/3除以(-3)
=(-49)÷(-7/3)÷ 7/3 ÷ (-3)
= - 49 × 3/7 × 3/7 ×1/3
= - 3
=(-3/5)x(-7/2)÷(-5/4)÷3
= - 3/5 x 7/2 x 4/5 x 1/3
= - 14/25
(-49)÷(-2又1/3)÷7/3除以(-3)
=(-49)÷(-7/3)÷ 7/3 ÷ (-3)
= - 49 × 3/7 × 3/7 ×1/3
= - 3
追问
那(-217又7/9)-(-7)和-22/7x(7/22-4/3)x7/22÷(-22/21)呢?不会亏待你的!
追答
(-217又7/9)-(-7)
= (-217又7/9+7
= - 210又7/9
= - 1897/9
-22/7x(7/22-4/3)x7/22÷(-22/21)
= - 22/7 x 7/22 x (7/22-4/3) x (-21/22)
= -1 x (7/22-4/3) x (-21/22)
= - 7/22 x (-21/22)+4/3(-21/22)
= 147/484 - 14/11
=- 469/484
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展开全部
(-3/5)x(-3又1/2)÷(-1又1/4)÷3
=(-3/5)x(-7/2)÷(-5/4)÷3
= - 3/5 x 7/2 x 4/5 x 1/3
= - 14/25
=(-3/5)x(-7/2)÷(-5/4)÷3
= - 3/5 x 7/2 x 4/5 x 1/3
= - 14/25
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评论
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