Question

用简便方法计算.1.6.27×3.6+37.8×0.36 2.369×0.99+3.69 3.（0.64+0.32）÷0？

Answer 1

1. 6.27×3.6+37.8×0.36
=6.27×3.6+3.78×3.6
=（6.27+3.78）×3.6
=10×3.6
=36
2. 369×0.99+3.69
=3.69×99+3.69
=3.69×（99+1）
=3.69×100
=369
3. （0.64+0.32）÷0.64
=（0.32×2+0.32）÷0.64
=（2+1）×0.32÷0.64
=3×0.32÷0.64
=3×（0.32÷0.64）
=3×0.5
=1.5
4. 13.5×2.5-0.35×25
=1.35×25-0.35×25
=（1.35-0.35）×25
=1×25
=25
5. 0.76÷0.4-0.38
=0.76÷0.4-0.76÷2
=0.76×2.5-0.76×0.5
=0.76×（2.5-0.5）
=0.76×2
=1.52
6. 12.8+0.792÷0.9
=12.8+7.92÷9
=12.8+0.88
=13.68,1,用简便方法计算.
1.6.27×3.6+37.8×0.36 2.369×0.99+3.69 3.（0.64+0.32）÷0.64 4.13.5×2.5-0.35×25 5.0.76÷0.4-0.38 6.12.8+0.792÷0.9