3.用简便方法计算.
问题描述：
3.用简便方法计算.
9.3×1.25×24 2.5×(40+04) 1.3×2.5+2.7×2.5 3.6×0.25
答
9.3×(1.25×24)=9.3×(1.25×8×3)=9.3×30=279
2.5×(40+0.4)=2.5×40+2.5×0.4=101（04按0.4算）
或2.5×(40+04)=2.5×40+2.5×4=110（04按4算）
1.3×2.5+2.7×2.5 =2.5（1.3+2.7）=10
3.6×0.25=0.9×4×0.25=4×0.25×0.9=0.9