(0.2+6.37÷0.7)×0.5=0.2×0.5+6.37÷0.7×0.5=0.1+9.1×0.5=0.1+4.55=4.655.7×2.9+4.3×2.9=(5.7+4.3) ×2.9=10×2.9=29 1.6×1.25×2.5=2×2.5=510.1×4.8=(10+0.1)×4.8=10×4.8+0.1×4.8=48+0.48=48.48