数学题(10√1⼀5+2⼀3√20)-(5⼀4√4⼀5-3⼀7√245) 要有过程.

2025-05-07 05:04:57
推荐回答(1个)
回答1:

(10√1/5+2/3√20)-(5/4√4/5-3/7√245)
=10√(1/5)+2/3√20-5/4√(4/5)+3/7√245
=10√(5/5²)+2/3√(2²×5)-5/4√[(2/5)²×5]+3/7√(7²×5)
=10×(√5)/5+(2/3)×2√5-5/4×2/5×√5+(3/7)×7√5
=2√5+(4√5)/3-(√5)/2+3√5
=5√5+(4√5)/3-(√5)/2
=(30√5+8√5-3√5)/6
=(35√5)/6