七年级上册的数学长江作业,怎么写?
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6、(-3又4分之1)×(-2又5分之4)=9又10分之11-3×(-2)+(-4)×(-5)=27
7、-2又5分之2的倒数是-12分之5
-2.5的倒数是-5分之2
计算:
(1) (-2)×5/4×(-9/10)×(-2/3)
=(-5/2)×(-9/10)×(-2/3)
=9/4×(-2/3)
=-3/2
=-1.5
(2)(-6)×5×(-7/6)×2/7
=(-6)×(-7/6)×2/7×5
=7×2/7×5
=2×5
=10
哪一题?
绛旓細锛
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