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209×115+115×209#0×109的简便运算.

最后一个是230×109

209乘以115+115乘以209-230乘以109 =(115+115)x209-230x109 =230x209-230x109 =230x(209-109) =230x100 =23000 【同学你好,如果问题已解决,记得右上角采纳哦~~~您的采纳是对我的肯定~谢谢哦】

209×(115+115)-230×109=209×230-109×230=230×(209-109)=230×100=23000

115x16 =125x16-10x16 =(125x8)x2 -160 =2000-160 =1840

115×115+35×115—15×150 =115×(115+35)—15×150 =115×150—15×150 =150×(115—15) =15000。

如下 115×12+115×88 =115×(12+88) =115×100 =11500

=(100+15)² =100²+2×100×15+15² =10000+3000+225 =13225

115×115 =(120-5)×115 =(100+20-5)×115 =100×115+20×115-5×115 =11500+2300-5×(120-5) =13800-5×120+5×5 =13800-600+25 =13200+25 =13225

115×98+98+98 =(115+1+1)×98 =117×98 =11466

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