(-3/4)-(-1/2)+3/4+(-8.5)过程?

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

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

(-3/4)-(-1/2)+3/4+(-8.5)过程?
(-3/4)-(-1/2)+3/4+(-8.5)
=-3/4+0.5+3/4-8.5
=（-3/4+3/4）+（-8.5+0.5）
=0-8
=-8

1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4 1+2+3+4+.