计算:(每小题4分,共24分)
(1)-5-1+3-7
(2)(—3)+(+8)—(—5)
(3)
(4)
(5)3×(-4)+28÷(-7)
(6)
(1)(-8)-47+18-(-27)
(2)(-3)×(-9)-8×(-5)
(3)
(4)计算:-5(x2-3)-2(3x2+5)
(5)化简并求值:4y2-(x2+y2)+(x2-4y2),其中x=-28,y=18
计算:
(1)12﹣(﹣15)+(﹣23)
(2)3×
(3)﹣23÷8﹣×(﹣2)2
(4)﹣6×.
计算
(1)-9+12-3+8
(2)(-1)+(-)+(+)-(+)
(3)(-3)÷2÷(-3)×(-0.75)
(4)-16-(1-0.5)××[2-(-3)2]
试题篮
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