计算:(1)8+(-14)-5-(-0.25)(2)-82+72÷36(3)712×134÷(-9+19)(4)25×34+(-25)×12+25×(-14)(5)(-79)÷214+49×(-29)(6)(-1)3-(1-12)÷3×[3-(-3)2](7)2(x-3)-3(-x+1)(8)-a+2(a-1)-(-数学
题文
计算: (1)8+(-
(2)-82+72÷36 (3)7
(4)25×
(5)(-79)÷2
(6)(-1)3-(1-
(7)2(x-3)-3(-x+1) (8)-a+2(a-1)-(3a+5) |
答案
(1)8+(-
=(8-5)+(-0.25+0.25) =3+0 =3; (2)-82+72÷36 =-82+2 =-80; (3)7
=
=
(4)25×
=25×(
=25×0 =0; (5)(-79)÷2
=-79×
=(-79-29)×
=-108×
=-48; (6)(-1)3-(1-
|