U?.Aa,9:犅犆U?.?è,犇犅=犇犉·犇犃=4,K犇犅=2,9:犃犅=4-2槡槡=23,*+犇+犅犆.T/,9:犅犆=4,犃犆=(槡23)+4槡槡=27,*+犆,犈,犉,犇~/)?,9:犃犈·犃犆=犃犉·犃犇,K槡27犃犈=12,K犃犈=67槡7,9:犈犆槡=27-67槡7=87槡7.10Z????????????????23.?:(Ⅰ)?犆+??O?+(狓-犪)+狔=犪,G??èO?+ρ=2犪cosθ,45v8?θ=0r,|犗犃|=ρ=1,9:犪=12,?犆+??O?+狓+(狔-犫)=犫,G??èO?+ρ=2犫sinθ,45v8?θ=π2r,|犗犅|=ρ=2,9:犫=1.5Z???????????????????????(Ⅱ)4犪,犫.nv8犆,犆.O?Zé+ρ=cosθ,ρ=2sinθ,9:2|犗犃|+|犗犃|·|犗犅|=2cosθ+2sinθcosθ=sin2θ+cos2θ槡+1=2sin(2θ+π4)+1,*+2θ+π4∈[π4,5π4],9:槡2sin(2θ+π4)+1YDn+槡2+1,?2θ+π4=π2,θ=π8r?;.10Z?????????????????????????????24.?:(Ⅰ)4犵(狓)≥-1,K-|2狓+犿|≥-1,|2狓+犿|≤1,9:-犿-12≤狓≤-犿+12,*+X?à.êk?+-3,`-犿-12≤-3≤-犿+12,?85≤犿≤7.wX?à??%{êk?-3,9:犿=6.5Z?????????????????????????(Ⅱ)*+犳(狓)-12犵(狓)>0,9:犪<2|狓-1|+|狓+3|,?6狓∈犚?h?,?犺(狓)=2|狓-1|+|狓+3|,`犺(狓)=-3狓-1,狓≤-35-狓,-3<狓≤13狓+1,狓>烅烄烆1,?@犺(狓)C28@?狓=1r,犺(狓)?8Yòn4,9:犪<4.10Z????????????????
全文预览