(1)0.2√900+0.5√121 (2)(√3-2)^2002*(√3+2)^2003 (3)√18+1/2√12-6√1/2+4√0.75
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(1) (0.2√900+0.5√121
=0.2×30+0.5×11
=6+5.5
=11.5
(2) (√3-2)^2002 *(√3+2)^2003
=[(√3-2)*(√3+2)]^2002*(√3+2)
=[(√3)^2-2^2]^2002
=(-1)^2002*(√3+2)
=1*(√3+2)
=√3+2
(3)√18+1/2√12-6√1/2+4√0.75
=3√2+√3-3√2+2√3
=3√3
=0.2×30+0.5×11
=6+5.5
=11.5
(2) (√3-2)^2002 *(√3+2)^2003
=[(√3-2)*(√3+2)]^2002*(√3+2)
=[(√3)^2-2^2]^2002
=(-1)^2002*(√3+2)
=1*(√3+2)
=√3+2
(3)√18+1/2√12-6√1/2+4√0.75
=3√2+√3-3√2+2√3
=3√3
追问
3√-5^2-10^2-2*3√1-19/27+3√2^3 怎么写?
追答
3(√-5)^2-10^2-2*3√1-19/27+3(√2)^3
=3*5-100-6-19/27+6√2
=-91-19/27+6√2
=-91又19/27+6√2
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