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简便运算3.6x31.4十43.9x6.4

题目详情
简便运算
3.6x31.4十43.9x6.4
▼优质解答
答案和解析
3.6x31.4+43.9x6.4
=3.6x31.4+31.4x6.4+12.5x6.4
=31.4x(3.6+6.4)+12.5x8x0.8
=314+100x0.8
=314+80
=394