能简便就简便:24×55×1.25 78×3.6+18×7.4-78 3又5分之1÷5/9×5/16 5.6+3/8÷12.5%
问题描述:
能简便就简便:24×55×1.25 78×3.6+18×7.4-78 3又5分之1÷5/9×5/16 5.6+3/8÷12.5%
答
24X55X1.25=3X8X55X1.25=3X55X(8X1.25)=3X55X10=165078X3.6+18X7.4-78=3.6X(78-5X7.4)=3.6X(78-37)-78=3.6X41-78=3.6X(40+1)-78=144-78+3.6=69.63又5分之1÷5/9×5/16 =16/5X9/5X5/16=9/55.6+3/8÷12.5%=5.6+3/8÷1...