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209×115+115×209#0×109的简便运算.

209×115+115×209-230×109的简便运算。 =209×(115+115-230) =209×0 =0

把中间的209拆开成100+109,变成,209*115 - 115*100 - 115*109 + 230*109

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

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家115×209 =209×30 =6270

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

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

115×100-115×2+100-2+100-2 =11500-230+200-4 =11500-34 =11466

115×7+109×5 =5×23×7+109×5 =5×161+109×5 =5×(161+109) =5×270 =5×2×135 =10×135 =1350

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