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25x13 75用简便方法计算

25*(2*13)=(25*2)*13=50*13=650

25x13 +13 +13x74 =13*(25+1+74) =13*100 =1300

53x25一25x13=(53-13)*25=40*25=1000

52*25-25*13=25*(52-13)=25*39=25*(40-1)=25*40-25=1000-25=975

25x79+75x13 =25x(40+39)+25x3x13 =25x40+25x39+25x39 =1000+25x2x39 =1000+50x39 =1000+1950 =2950 请采纳,您的采纳是我答题的动力,谢谢.

53*25一25x13=(53-13)*25=40*25=4*25*10=1000

(25x13)x4=25x4x13=100x13=1300

25x79+75x13=25x79+25x3x13=25x79+25x(3x13)=25x79+25x39=25x(79+39)=25x118=25x2x59=50x59=50x(60-1)=50x60-50x1=3000-50=2950

25x75-25x1+25x3=25x(75-1+3)=25x77=1925

25x79十75x13=25x(79+13x3)=25x(79+39)=25x(100+10+8)=2500+250+100=2850

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