(3/4)-(1/2)+(+3/4)+(-8.5) 求解?
3个回答
(3/4)-(1/2)+(+3/4)+(-8.5)
=0.75-0.5+0.75-8.5
=(0.75+0.75)-(0.5+8.5)
=1.5-9
=-7.5
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