赚现金
先化简,再求值: a 2 - 2 a + 1 a 2 - 4 ÷ a - 1 a - 2 + 1 a + 2 ,其中 a=|﹣1﹣ 3 |﹣tan60°+( 1 2 ) ﹣ 1.
计算:(﹣ 1 2 ) ﹣ 2﹣ 27 3 ﹣(﹣2) 0+ 3 tan30°.
先化简(1﹣ 3 x - 2 )÷ x 2 - 2 x + 1 x 2 - 4 ,然后从不等式2 x﹣6<0的非负整数解中选取一个合适的解代入求值.
计算: - | 4 - 12 | - ( π - 3 . 14 ) 0 + 1 - cos 30 ∘ × 1 2 - 2 .
计算
(1)计算:2 ﹣ 2+(3 27 ﹣ 1 4 6 )÷ 6 ﹣3sin45°;
(2)解方程: x - 3 x - 2 +1= 3 2 - x .
(1)化简求值: 2 x x + 1 + 4 - 2 x x 2 - 1 ÷ x - 2 x 2 - 2 x + 1 ,其中 x=﹣2 2+2sin45°+|﹣3|;
(2)解不等式组: x - 3 ( x - 2 ) ≤ 8 ① 2 x - 1 5 > x + 1 2 - 1 ② ,并求其非负整数解.
先化简,再求值: x 2 x + 1 - x + 1 ,其中 x= 12 ﹣( 1 4 ) ﹣ 1﹣|1﹣ 3 |.
(1)计算: ( - 1 ) 2018 - 2 cos 30 ∘ - 1 2 - 2 - | 3 - 2 | + ( 2018 - π ) 0
(2)先化简,再求值: x 2 - 2 x + 1 x 2 - x - 4 - x 2 x 2 + 2 x ÷ x - 4 x ,且 x为满足﹣3< x<2的整数.
(1)计算: | - 2 | - 2016 0 + 1 2 - 2
(2)解不等式组: 2 3 x > 5 - x x + 2 > 2 x - 3 .
先化简,再求值: 3 x + 1 - x + 1 ÷ x 2 + 4 x + 4 x + 1 ,其中 x = 2 - 2 .
计算: - | - 1 | + 12 ⋅ cos 30 ∘ - - 1 2 - 2 + ( π - 3 . 14 ) .
计算: | - 2 | + 9 × ∣ 1 2 - 1 - 4 × 1 2 - ( π - 1 ) 0 .
先化简,再求值: a 2 - 3 a a 2 + a ÷ a - 3 a 2 - 1 ⋅ a + 1 a - 1 ,其中a=2016.
计算: ( - 1 ) 2016 + 2 sin 60 ∘ - | - 3 | + π 0 .
解不等式 x + 1 2 ⩾ 3 ( x - 1 ) - 4 .
试题篮