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0.7777×0.7+0.1111×2.1的简便运算

人气:249 ℃ 时间:2019-10-19 16:57:50
解答
0.7777X0.7X3+0.1111X2.1X3=nX3 0.7777 x 2.1 + 0.3333 x 2.1=n x 3 (0.7777+0.3333) x 2.1 = n x 3 (0.7777+0.3333) x 2.1 ÷ 3 = n x 3 ÷ 3 (0.7777+0.3333) x 0.7 = n 1.111x 0.7 = n n=0.7777
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