99999×77778+33333×66666巧算
问题描述：
99999×77778+33333×66666巧算
答
99999×77778+33333×66666
=99999×77778+33333×3×22222
=99999×77778+99999×22222
=99999×（77778+22222）
=99999×100000
=999990000017.5+17.5×1.74÷【0.1-0.04】巧算17.5+17.5×1.74÷【0.1-0.04】
=17.5+17.5×1.74÷0.06
=17.5+17.5×29
=17.5x(1+29)
=17.5x30
=525{【12.5+1.25+0.125】×80-999}÷0.03巧算{【12.5+1.25+0.125】×80-999}÷0.03
={【12.5+12.5/10+12.5/100】×80-999}÷0.03
={12.5x(1+1/10+1/100)x80-999}÷0.03
={12.5x80x(1+1/10+1/100)-999}÷0.03
={1000x(1+1/10+1/100)-999}÷0.03
={1000+100+10-999}÷0.03
={1000-999+100+10}÷0.03
={1+100+10}÷0.03
=111÷0.03
=3700