初二 二次根式计算题
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发布时间:2022-04-24 18:14
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热心网友
时间:2023-10-31 01:35
1.原式=5*2√2-2*4√2+5√2=7√2
2.原式=√6-(√6)/2-(√6)/3=(√6)/6
3.原式=(3√5+3√3)-(2/3√3+5√5)=-2√5+7/3√3
4.原式=(2√a-5√2b)-2(1/2√2b+3√a)=-4√a-6√2b
5.原式=2√x*(1/2√6x-1/6√6x)=2x/3√6
6.原式=(x√y-y√x)÷√xy=x√y÷√xy-y√x÷√xy=√x-√y
7.原式=(3√7+2√3)(2√3-3√7)=(2√3+3√7)(2√3-3√7)=12-63=-51
8.原式=(4√2-3√3)(4√2+3√3)=32-27=5
9.原式=54-6√24+4=58-12√6
10.原式=[1+(√2-√3)][1-(√2-√3)]
=1-(√2-√3)^2=1-(5-2√6)
=2√6-4
热心网友
时间:2023-10-31 01:36
①5√8-2√32+√50
=5*3√2-2*4√2+5√2
=√2(15-8+5)
=12√2
②√6-√3/2-√2/3
=√6-√6/2-√6/3
=√6/6
③(√45+√27)-(√4/3+√125)
=(3√5+3√3)-(2√3/3+5√5)
=-2√5+7√5/3
④(√4a-√50b)-2(√b/2+√9a)
=(2√a-5√2b)-2(√2b/2+3√a)
=-4√a-6√2b
⑤√4x*(√3x/2-√x/6)
=2√x(√6x/2-√6x/6)
=2√x*(√6x/3)
=2/3*|x|*√6
⑥(x√y-y√x)÷√xy
=x√y÷√xy-y√x÷√xy
=√x-√y
⑦(3√7+2√3)(2√3-3√7)
=(2√3)^2-(3√7)^2
=12-63
=-51
⑧(√32-3√3)(4√2+√27)
=(4√2-3√3)(4√2+3√3)
=(4√2)^2-(3√3)^2
=32-27
=5
⑨(3√6-√4)²
=(3√6)^2-2*3√6*√4+(√4)^2
=54-12√6+4
=58-12√6
⑩(1+√2-√3)(1-√2+√3)
=[1+(√2-√3)][1-(√2-√3)]
=1-(√2-√3)^2
=1-(2+3+2√6)
=-4-2√6
热心网友
时间:2023-10-31 01:36
1、7倍根号2
2、6分之根号6
3、(3分之7倍根号3)-(2倍根号5)
4、-4倍根号a-6倍根号2b
5、三分之2倍(根号6)x
6、根号x-根号y
7、-51
8、5
9、58-12倍根号6
10、2倍根号6
热心网友
时间:2023-10-31 01:37
还可以啊,不是很困难,但是要在电脑上算太不习惯了,还是习惯在纸上草稿~
热心网友
时间:2023-10-31 01:38
①5√8-2√32+√50
=5*3√2-2*4√2+5√2
=√2(15-8+5)
=12√2
②√6-√3/2-√2/3
=√6-√6/2-√6/3
=√6/6
③(√45+√27)-(√4/3+√125)
=(3√5+3√3)-(2√3/3+5√5)
=-2√5+7√5/3
④(√4a-√50b)-2(√b/2+√9a)
=(2√a-5√2b)-2(√2b/2+3√a)
=-4√a-6√2b
⑤√4x*(√3x/2-√x/6)
=2√x(√6x/2-√6x/6)
=2√x*(√6x/3)
=2/3*|x|*√6
⑥(x√y-y√x)÷√xy
=x√y÷√xy-y√x÷√xy
=√x-√y
⑦(3√7+2√3)(2√3-3√7)
=(2√3)^2-(3√7)^2
=12-63
=-51
⑧(√32-3√3)(4√2+√27)
=(4√2-3√3)(4√2+3√3)
=(4√2)^2-(3√3)^2
=32-27
=5
⑨(3√6-√4)²
=(3√6)^2-2*3√6*√4+(√4)^2
=54-12√6+4
=58-12√6
⑩(1+√2-√3)(1-√2+√3)
=[1+(√2-√3)][1-(√2-√3)]
=1-(√2-√3)^2
=1-(2+3+2√6)
=-4-2√6