计算题:
(1)﹣(﹣18)+12﹣15+(﹣17)
(2)
(3)
(4)
计算题
(1)(-2)3×
+(-1)2003-
;
(2)|-1|+(-2)2+(7-π)0-(
)-1.
计算:
(1)3—4.3—7+5.3;
(2)
;
(3)
;
(4)
.
计算:
(1)-3-5+12;
(2)(-81)÷
×
÷(-16);
(3)-32-25×(-
)2;
(4)-24×(-
+
-
);
(5)-14-(1+0.5)×
÷4;
(6)-22×
-(-1
)2÷(-
)-(-1)5.
计算
(1)
(2)
(3)
(4)
(5)
(6)19
×(-12)
(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