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(1)计算: 4 × ( - 3 ) + | - 8 | - 9 + ( 7 ) 0 .
(2)化简: ( a - 5 ) 2 + 1 2 a ( 2 a + 8 ) .
计算: | - 2 | + 12 - 3 .
(1)计算: 4 sin 60 ° - 12 + ( 2 - 3 ) 0 .
(2)解不等式: 5 x + 3 ⩾ 2 ( x + 3 ) .
计算: 9 + ( 1 2 ) 0 - | - 3 | + 2 cos 60 ° .
计算: | - 2021 | + ( - 3 ) 0 - 4 .
计算: ( - 1 ) 2021 + 8 - 4 sin 45 ° + | - 2 | .
(1)计算: 2 - 1 + 12 - sin 30 ° ;
(2)化简并求值: 1 - a a + 1 ,其中 a = - 1 2 .
计算: ( - 3 ) 2 + tan 45 ° 2 + ( 2 - 1 ) 0 - 2 - 1 + 2 3 × ( - 6 ) .
计算: ( 2 - 1 ) 0 + | - 3 | - 27 3 + ( - 1 ) 2021 .
计算: 25 - | - 7 | + ( 2 - 3 ) 0 .
(1)计算: ( π - 3 ) 0 - 12 + 4 sin 60 ° - ( 1 2 ) - 1 ;
(2)化简: ( 2 a - 1 + 1 ) ÷ a 2 + a a 2 - 2 a + 1 .
(1)计算: ( 1 2 ) - 2 + ( 3 . 14 - π ) 0 + | 3 - 12 | - 4 sin 60 ° .
(2)先化简,再求值: ( 1 x - 1 - x + 1 ) ÷ x - 2 x 2 - 1 ,其中 x = 2 - 1 .
计算: ( - 1 2 ) - 1 + tan 60 ° - | 2 - 3 | + ( π - 3 ) 0 - 12 .
计算: ( 2021 π ) 0 + ( 1 4 ) - 1 - ( - 4 ) + 2 3 cos 30 ° .
计算: ( 3 . 14 ﹣ π ) 0 - 27 + | 1 - 3 | + 4 sin 60 ° .
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