Question

0.5×87x5+25x1.3怎么算？

Answer 1

0.5×87x5+25x1.3
=2.5×87+25x1.3
=25×8.7+25x1.3 [或=2.5×87+25x13]
=25×(8.7+1.3) [=2.5×(87+13) ]
=25×10 [=2.5×100]
=250 [=250]

Answer 2

0.5×87×5+25×1.3
=2.5×87+25×1.3
=25×8.7+25×1.3
=25×(8.7+1.3)
=25×10
=250