问题
解答题
计算 (1)-2-(-3)+(-8) (2)-39
(3)-14-
(4)6.868×(-5)+(-6.868)×12+17×6.868 (5)(-1)3-(-8
(6)-12-[1
|
答案
(1)-2-(-3)+(-8)=-2+3-8=-10+3=-7;
(2)原式=(-40+
)×13=-40×13+9 26
×13=-515.5;9 26
(3)原式=-1-
×(2-9)=-1-1 6
×(-7)=-1+1 6
=7 6
;1 6
(4)原式=6.868×[(-5)+(-12)+17]=0;
(5)原式=-1-(-
)×17 2
+(-27)÷(-32+5)=(-1)+2+(-27)÷(-27)=(-1)+2+1=2;4 17
(6)原式=-1-(
-2)2×(-10 7
)3=-1-(-7 4
)2×(-4 7
)3=-1+7 4
=7 4
.3 4