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简便计算,11X11一11

=(11x11)(11-1)-10 =(11x11)10-10 =10(11x11-1) =1200

11X11一11 =11×(11-1) =11×10 =110

12x12十11x11一12x11一11x10 =12x12一12x11十(11x11一11x10) =12x(12一11)十11x(11一10) =12+11 =23

原式 =11/10x11/10x11/10-11/10x11/10 =11/10x11/10x11/10-11/10x11/10x1 =11/10x11/10x(11/10-1) =11/10x11/10x1/10 =(11x11)/(10x10x10) =121/1000 其中,/是分数线。 供参考。

=119+(10-19)×11 = 119 - 9×11 = 119 - 99 = 119 - 100 + 1 = 19 + 1 = 20

原式 =11x11x35x2 =121x70 =8470

用简便方法计算380x11一380 380x11一380 =380*(11-1) =380*10 =3800

原式 =2/11x11x13+1/13x11x13 =(2/11x11)x13+(1/13x13)x11 =2x13+1x11 =26+11 =37 供参考。

25×11×4 =25x4x11 =100x11 =1100

13x(3/11+1/13)x11 =13x(39/143+11/143)x11 =13x50/143x11 =50 谢谢,请采纳

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