25×3又 3/4—0.51×1/4+2.5×（-17.5）—5.1×0.075等于多少?急死我了

25×3又 3/4—0.51×1/4+2.5×（-17.5）—5.1×0.075等于多少?急死我了
25×3又 3/4—0.51×1/4+2.5×（-17.5）—5.1×0.075等于多少?急死我了

25×3又 3/4—0.51×1/4+2.5×（-17.5）—5.1×0.075等于多少?急死我了
25×3又 3/4—0.51×1/4+2.5×（-17.5）—5.1×0.075
=25×15/4-5/2×35/2-0.51×(1/4+0.75)
=75×5/4-35×5/4-0.51×1
=40×5/4-0.51
49.49