7.69×2.1十0.21×13.1+2.1的简算？
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7.69*2.1+0.21*13.1+2.1
=7.69*2.1+0.21*1.31*10+2.1
=7.69*2.1+2.1*1.31+2.1
=(7.69+1.31+1)*2.1
=10*2.1
=21
=7.69*2.1+0.21*1.31*10+2.1
=7.69*2.1+2.1*1.31+2.1
=(7.69+1.31+1)*2.1
=10*2.1
=21
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7.69×2.1+0.21×13.1+2.1
=7.66×2.1+2.1×1.31+2.1
=2.1×（7.69+1.31+1）
=2.1×10
=21
所以，我们可以通过上面的简便计算过程运算进行详细计算，得到答案是21。
=7.66×2.1+2.1×1.31+2.1
=2.1×（7.69+1.31+1）
=2.1×10
=21
所以，我们可以通过上面的简便计算过程运算进行详细计算，得到答案是21。
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7.69*2.1+0.21*13.1+2.1
=7.69*2.1+0.21*1.31*10+2.1
=7.69*2.1+2.1*1.31+2.1
=(7.69+1.31+1)*2.1
=10*2.1
=21
=7.69*2.1+0.21*1.31*10+2.1
=7.69*2.1+2.1*1.31+2.1
=(7.69+1.31+1)*2.1
=10*2.1
=21
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7.69×2.1+0.21×13.1+2.1
=7.69×2.1+2.1×1.31+2.1
=（7.69+1.31+1）×2.1
=10×2.1
=21
=7.69×2.1+2.1×1.31+2.1
=（7.69+1.31+1）×2.1
=10×2.1
=21
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7.69×2.1+0.21×13.1+2.1
=7.69×2.1+2.1×0.1 ×13.1+2.1
=2.1×(7.69+0.1×13.1+1)
=2.1×10
=21
=7.69×2.1+2.1×0.1 ×13.1+2.1
=2.1×(7.69+0.1×13.1+1)
=2.1×10
=21
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