(5⼀7+3⼀13)乘7-3⼀13 简算 1⼀4除以(2⼀3-2⼀5)乘3⼀5

(5/7+3/13)乘7-3/13 简算1/4除以(2/3-2/5)乘3/5
2025-01-03 07:31:31
推荐回答(1个)
回答(1):

(5/7+3/13)*7-3/13
=5+3/13*7-3/13*1
=5+(7-1)*3/13
=5+6*3*13
=5+18/13
=83/13

1/4/(2/3-2/5)*3/5
=1/4/(2/3*3/5-2/5*1/5)
=1/4/(2/5-2/5*1/5)
=1/4/2/5(1-1/5)
=1/4/2/5*4/5
=1/4*2/5
=2/20
=1/10