二道八年级计算题?

来源:百度知道 编辑:UC知道 时间:2024/05/13 02:35:53
题目见图

要求写出详细过程。谢谢!

1 :[2*(√3+√2)+(2√3+√2)]*(4√3-3√2)
=(4√3+3√2)*(4√3-3√2)
=48-18=30
2 :(√5+√7+√7+3)/[(√5+√7)(√7+3)]
=1/(√5+√7) + 1/(√7+3)
= (√7-√5)/2 +(3-√7)/2
=(3-√5)/2

1 :[2*(√3+√2)+(2√3+√2)]*(4√3-3√2)
=(4√3+3√2)*(4√3-3√2)
=48-18
=30
2 :(√5+√7+√7+3)/[(√5+√7)(√7+3)]
=1/(√5+√7) + 1/(√7+3)
= (√7-√5)/2 +(3-√7)/2
=(3-√5)/2
好好学加油!

1 、[2×(√3+√2)+(2√3+√2)]×(4√3-3√2)

=(4√3+3√2)×(4√3-3√2)

=48-18

=30

2 、(√5+√7+√7+3)÷[(√5+√7)(√7+3)]

=1÷(√5+√7) + 1÷(√7+3)

= (√7-√5)÷2 +(3-√7)÷2

=(3-√5)÷2