问题
解答题
计算: (1)22+(-4)+(-2)+4; (2)(-8)+(+0.25)-(-9)+(-
(3)(1
(4)(-
(5)(1
(6)19×
|
答案
(1)原式=22-2=20;
(2)原式=-8+
+9-1 4
=1;1 4
(3)原式=(
-7 4
-7 8
)×(-7 12
)=8 7
×(-7 4
)-8 7
×(-7 8
)-8 7
×(-7 12
)=-2+1+8 7
=-2 3
;1 3
(4)原式=-
÷(7 30
-18 30
-5 30
)=-20 30
÷(-7 30
)=1;7 30
(5)原式=(
+4 3
-1 8
)×(-24)-8=11 4
×(-24)+4 3
×(-24)-1 8
×(-24)-8=-32-3+66-8=23;11 4
(6)原式=(19+18-19)×
=18×2 5
=2 5
.36 5