72.8÷5.6+14.9=72.8÷（8×0.7）+14.9 =9.1÷0.7+14.9=13+14.9=27.917.36×0.25×8=17.36×（0.25×8）=17.36×2=34.72 1.2×（3.2-2.99÷2.3）=1.2×（3.2-1.3）=1.2×（2-0.1）=2.4-0.12=2.2875÷4+25×0.25=75×1/4+25×1/4=100×1/4=25
