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(1)计算: 2 sin 45 ∘ - 3 - 2 + ( π - 2017 ) 0 + | 2 - 2 | + 1 81
(2)先化简: x 2 + x x 2 - 2 x + 1 ÷ 2 x - 1 - 1 x ,再求当 x+1与 x﹣5互为相反数时代数式的值.
(2)先化简: x 2 + x x 2 - 2 x + 1 ÷ 2 x - 1 - 1 x ,再求当x+1与x﹣5互为相反数时代数式的值.
计算: 3 tan 30 ∘ - 3 3 + ( 2016 + π ) 0 + - 1 2 - 2 .
计算. - 2 2 × ( 2016 - π ) 0 - 1 2 - 2 - | - 2 | = .
计算: - 1 3 - 1 + 3 tan 30 ∘ - 27 + ( - 1 ) 2016 .
(1)计算: ( - 1 ) 2016 - 4 cos 60 ∘ + ( 3 - 2 ) 0 - 1 3 - 2 ;
(2)先化简,再求值: y 2 xy + 2 y 2 - 1 y - 1 ÷ x + 2 y y 2 - 2 y + 1 ,其中3 x+6 y﹣1=0.
(1)计算: ( - 3 ) 2 - ( π - 1 ) 0 + tan 60 ∘ + | 3 - 2 | ;
(2)解不等式组 2 ( x - 1 ) ≤ 3 x + 1 ⋯ ① 1 2 x ≤ 8 - 3 2 x ⋯ ② ,并把解集在数轴上表示出来.
计算: 1 2 - 2 - | - 1 + 3 | + 2 sin 60 ∘ + ( - 1 - 3 ) 0 .
(1) 8 + ( 1 2 ) - 1 - 2 cos 45 ° - ( π -2016 ) 0
(2)2y2+4y=y+2.
计算 | - 2 | - 3 0 = .
计算: | - 2 | - 1 2016 0 + 4 .
计算: ( π - 3 ) 0 + | - 2 | - 20 ÷ 5 + ( - 1 ) - 1 .
计算: | 2 - 3 | - 16 + 1 3 0 .
计算: 12 + ( π - 3 ) 0 - 2 cos 30 ∘ .
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