问题
解答题
计算 (1)(+18)+(-12); (2)
(3)(
(4)|-1.5|-(-3.6)+|+1.4|-4.5. |
答案
(1)原式=18-12=6;
(2)原式=(
-1 2
)+(1 2
-12 3
)=0-1=-1;2 3
(3)原式=32-12-18=32-30=2;
(4)原式=1.5+3.6+1.4-4.5=6.5-4.5=2.
计算 (1)(+18)+(-12); (2)
(3)(
(4)|-1.5|-(-3.6)+|+1.4|-4.5. |
(1)原式=18-12=6;
(2)原式=(
-1 2
)+(1 2
-12 3
)=0-1=-1;2 3
(3)原式=32-12-18=32-30=2;
(4)原式=1.5+3.6+1.4-4.5=6.5-4.5=2.