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简便计算2/15*4.69+3.21*152/15+7.9*15/13
题目详情
简便计算
2/15*4.69+3.21*152/15+7.9*15/13
2/15*4.69+3.21*152/15+7.9*15/13
▼优质解答
答案和解析
2/15*4.69+3.21*152/15+7.9*13/15
=2/15*4.69+3.21*10+3.21×2/15+7.9*13/15
=2/15*（4.69+3.21）+32.1+7.9*13/15
=2/15*7.9+7.9*13/15+32.1
=（2/15+13/15）*7.9+32.1
=7.9+32.1
=40
=2/15*4.69+3.21*10+3.21×2/15+7.9*13/15
=2/15*（4.69+3.21）+32.1+7.9*13/15
=2/15*7.9+7.9*13/15+32.1
=（2/15+13/15）*7.9+32.1
=7.9+32.1
=40
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