3.6×0.71+0.36x2.8+0.036=3.6×0.71+3.6x0.28+3.6x0.01=3.6x(0.71+0.28+0.01)=3.6x1=3.6
原式=3.6×0.71+3.6×0.28+0.01×3.6=3.6×(0.71+0.28+0.01)=3.6×1=3.6
