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用简便计算(1)题:3/4X2/9+0.75X5/9,(2)题:1/7X5/12+5/12÷7/5

题目详情
用简便计算(1)题:3/4X2/9+0.75X5/9,(2)题:1/7X5/12+5/12÷7/5
▼优质解答
答案和解析
3/4X2/9+0.75X5/9=3/4X2/9+3/4X5/9=3/4X(2/9+5/9)=3/4X7/9=7/12
1/7X5/12+5/12÷7/5=1/7X5/12+5/12X5/7=5/12X(1/7+5/7)=5/12X6/7=5/14