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计算: 16 + ( 4 - π ) 0 + ( - 1 ) - 1 - 6 sin 30 ° .
计算: | - 3 | - 9 + 1 .
计算: 4 + ( - 1 ) 0 + | π - 2 | - 3 tan 30 ° .
(1)计算: 8 + ( π + 2 ) 0 + ( - 1 ) 2021 - 2 cos 45 ° ;
(2)解分式方程: x - 3 x - 2 + 1 = 3 2 - x .
计算: ( 2021 - π ) 0 + ( 1 2 ) - 1 - 2 cos 45 ° .
(1)计算 ( - 1 2 ) - 1 - 3 tan 60 ° + - 3 + ( 2 cos 60 ° - 2020 ) 0 ;
(2)解不等式组: 3 - x 2 ≤ 1 3 x + 2 ≥ 4 .
计算: ( 1 3 - 1 2 ) 2 + 2 2 × 1 6 - sin 60 ° .
计算: 2 - 1 + | 6 - 3 | + 2 3 sin 45 ° - ( - 2 ) 2020 · ( 1 2 ) 2020 .
(1)计算: 27 + ( 2 cos 60 ° ) 2020 - ( 1 2 ) - 2 - | 3 + 2 3 | ;
(2)先化简,再求值: ( x - 2 xy - y 2 x ) ÷ x 2 - y 2 x 2 + xy ,其中 x = 2 + 1 , y = 2 .
先化简,再求值: 1 - y - x x + 2 y ÷ x 2 - y 2 x 2 + 4 xy + 4 y 2 ;其中 x = cos 30 ° × 12 , y = ( π - 3 ) 0 - ( 1 3 ) - 1 .
(1)计算: 4 - | - 2 | + ( 6 ) 0 - ( - 1 ) .
(2)化简: ( x - 1 ) 2 - x ( x + 7 ) .
计算: | - 3 | + 8 - 2 .
(1)计算: 8 - 4 cos 45 ° + ( - 1 ) 2020 .
(2)化简: ( x + y ) 2 - x ( x + 2 y ) .
计算: | - 2 | + ( 1 3 ) 0 - 9 + 2 sin 30 ° .
计算: ( - 2020 ) 0 + 4 - tan 45 ° + | - 3 | .
试题篮