计算: ( π - 10 ) 0 + | 2 - 1 | + 1 2 - 1 - 2 sin 45 ∘ .
计算: (1)sin30°-cos45°+tan260° (2)
计算: (1).(2)
计算:
(每小题3分,共6分)计算: (l)-4×(-3)÷(-2); (2)--[+(1-)÷(-2)].