(3/4)-(1/2)+(+3/4)+(-8.5) 求解?

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(3/4)-(1/2)+(+3/4)+(-8.5) 求解?
(3/4)-(1/2)+(+3/4)+(-8.5) 求解?

(3/4)-(1/2)+(+3/4)+(-8.5) 求解?
(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

-7.5

=3/2-1/2-8.5
=1-8.5
=-7.5