解:
原式
=62x120-62x28
=62x(120-28)
=62x92
=62x(100-8)
=62x100-62x8
=6200-496
=6200-(500-4)
=6200-500+4
=5704
方法:构造后利用乘法分配率实现简便计算的
62×120-28×62简便计算如下:
62×120-28×62
=62×(120-28)
=62×(100-8)
=62×100-62×8
=6200-496
=6200-500+4
=5700+4
=5704
62×12O-28x62
=62(12O-28)
=62(100-8)
=62Ⅹ10O-62Ⅹ8
=6200-496
=5704
如图,不懂可追问,望采纳