Question

用简便方法计算3.6+8.59+6.4 &nbs...

用简便方法计算3.6+8.59+6.4 312×4+188×425×33×4 101×87．

Answer 1

（1）3.6+8.59+6.4
=（3.6+6.4）+8.59
=10+8.59
=18.59；

（2）312×4+188×4
=（312+188）×4
=500×4
=2000；

（3）25×33×4
=（25×4）×33
=100×33
=3300；

（4）101×87
=（100+1）×87
=100×87+1×87
=8700+87
=8787．

Answer 2

3.6+8.59+6.4
=3.6+6.4+8.59
=10+8.59
=18.59