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计算: | 3 - 1 | + ( π - 2021 ) 0 = .
计算: 2 cos 45 ° + ( 1 3 ) - 1 - | - 3 | .
计算: | 1 - 2 | + ( 1 2 ) - 1 + 2 cos 45 ° + ( - 1 ) 0 = .
计算: ( 1 2 ) - 1 - | 3 - 2 | = .
计算: | 1 - 3 | - 2 sin 60 ° + ( π - 1 ) 0 .
计算 | 2 - 2 | + 2 sin 45 ° - ( - 1 ) 2 .
(1)计算: 3 - 1 - 1 9 + ( 3 - 3 ) 0 ;
(2)化简: ( 1 - 1 x ) ÷ 2 x - 2 x 2 .
与 3 2 - 2 2 - 1 2 结果相同的是 ( )
3 - 2 + 1
3 + 2 - 1
3 + 2 + 1
3 - 2 - 1
下列等式正确的是 ( )
| - 3 | + tan 45 ° = - 2
( xy ) 5 ÷ ( x y ) 5 = x 10
( a - b ) 2 = a 2 + 2 ab + b 2
x 3 y - x y 3 = xy ( x + y ) ( x - y )
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 ° .
计算: ( 2021 - π ) 0 + ( 1 2 ) - 1 - 2 cos 45 ° .
计算: 12 + | 3 - 3 | - ( 1 3 ) - 1 .
计算: 2 sin 60 ° + 12 + | - 5 | - ( π + 2 ) 0 .
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