www.5129.net > 2.9x2.9+2.9x6.1+2.9巧算

2.9x2.9+2.9x6.1+2.9巧算

=2.9*(2.9+6.1+1)=2.9*10=29

2.9x2.9+2.9x8.1-2.9=(2.9+8.1-1)x2.9=10x2.9=29

2.9 6.1 2.9-6.1=6.1(2.9*2.9-1)=6.1*(2.9-1)(2.9+1)=6.1*1.9*3.9=(6+0.1)(2-0.1)*3.9=(6*2-0.4-0.01)*3.9=(12-0.41)(4-0.1)=12*4-1.2-1.64+0.041=45.201

2.9+6.7*2.9+2.9*2.3=2.9*(1+6.7+2.3)=2.9*10=29

7.8x2.9+2.9x2.1+2.9=(7.8+2.1)*2.9+2.9=(7.8+2.1+0.1)*2.9+2.9-0.29=29+2.9-0.29=31.9-0.29=31.61

3.6x2.5 =0.9*(4*2.5) =0.9*10 =9 (12.4+4)x2.5 =12.4*2.5+4*2.5 =31+10 =41 1.02x2.5 =(1+0.02)*2.5 =2.5*1+2.5*0.02 =2.5+0.05 =2.55 12.4x4x2.5 =12.4*(4*2.5) =12.4*10 =124 4.38x8.02+8.02x4.62+8.02 =8.02*(4.38+4.62+1) =8.02*10 =80.2 2.9x

2.9X(5.7+5.3)-2.9=28

您好,寒樱暖暖为你解答:原式=2.9*(2.5+15) =2.9*17.5 =(3-0.1)*17.5 =3*17.5 - 1.75 =25.5-1.75 =50.75如果你认可我的回答, 请及时点击【采纳为满意回答】按钮,(或在客户端右上角评价点【满意】)你的采纳, 是我前进的动力! 你的采纳也会给你带去财富值的.如有不明白, 可以追问,直到完成弄懂此题!

2.9x3.5+3.5x6.1=3.5x(2.9+6.1)=3.5x9=3.5x(10-1)=35-3.5=31.5 朋友,请【采纳答案】,您的采纳是我答题的动力,谢谢.

2.9x5.2+29x0.58-2.9=2.9x5.2+2.9x5.8-2.9=2.9*(5.2+5.8-1)=2.9*10=29

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