2613x15013的精選

4.2×2.6+1.3x1.5+0.13簡便運算如下：4.2×2.6+1.3x1.5+0.13=4.2×2×1.3+1.3×1.5+1.3×0.1=8.4×1.3+1.3×1.5+1.3×0.1=(8.4+1.5+0.1)×1.3=10×1.3=13。簡便運算是一種高階的混合運...