0.87×2.3+8.7×77简便运算怎么简便运算那?

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0.87×2.3+8.7×77简便运算怎么简便运算那?
0.87×2.3+8.7×77简便运算
怎么简便运算那?

0.87×2.3+8.7×77简便运算怎么简便运算那?
0.87×2.3+8.7×77
=0.87×2.3+0.87×770
=0.87×(2.3+770)
=0.87×772.3
=671.901

0.87×2.3+8.7×77
=0.87×2.3+0.87×10×77
=0.87×(2.3+10×77)
=0.87×772.3