简算题一道

(0.75×3.24+1.67×75%)÷0.75×900×(1-80%)÷3/4
=(3/4×3.24+1.67×3/4)÷3/4×900×(1-80%)÷3/4
=3/4×(3.24+1.67)÷3/4×900×(1-80%)÷3/4
=3/4×4.91×4/3×900×(1-80%)÷3/4
=4.91×900×(1-80%)×4/3
=4.91×900×1/5×4/3
=4.91×1200×1/5
=4.91×240
=(5-0.09)×240
=5×240-0.09×240
=1200-21.6
=1178.4