56.9×0.47-13.5=26.743-13.5=13.2439.4×10.1=9.4×(10+0.1)=94+0.94=94.9480×476×125×0=(80×125)×(476×0)=10000×0=02.52×99=2.52×(100-1)=252-2.52=249.48
56.9x0。47~0