12.5乘以28的简便运算怎么写

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12.5乘以28的简便运算怎么写
12.5乘以28的简便运算怎么写

12.5乘以28的简便运算怎么写
12.5*28
=12.5*4*7
=50*7=350
12.5*28
=12.5*(20+8)
=12.5*20+12.5*8
=250+100
=350
12.5*28
=12.5*2*2*7
=25*2*7
=50*7
=350

12.5*(20+8)

25/2*4*7=350

61+4×610+59×61 =61×1+40×61+59×61 =61×(1+40+59)=61×100 =6100 61+4*610+59*61 =61+40*61+59*61 =(1+40+59)*