简便计算:7/8×(1-75%)+1/4+0.25×1/2 49.5×13.5+50.5×13-0.5×49.5

您好：

7/8×(1-75%)+1/4+0.25×1/2
=7/8x1/4+1/4+1/4x1/2
=1/4x(7/8+1+1/2)
=1/4x19/8
=19/32

49.5×13.5+50.5×13-0.5×49.5
=49.5x(13.5-0.5)+50.5x13
=49.5x13+50.5x13
=(49.5+50.5)x13
=100x13
=1300

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