计算: (1)8+(-1/4)-5-(-0.25) (2)-82+72÷36 (3)71/2×13/4÷(-9+19) (4)25×3/4-(-25)×1/2+25×(-1/4) (5)(-81)÷21/4+4/9÷(-16) (6)(-1

问题描述:

计算:
(1)8+(-

1
4
)-5-(-0.25)
(2)-82+72÷36
(3)7
1
2
×1
3
4
÷(-9+19)
(4)25×
3
4
-(-25)×
1
2
+25×(-
1
4

(5)(-81)÷2
1
4
+
4
9
÷(-16)
(6)(-1)3-(1-
1
2
)÷3×[2-(-3)2]
(7)
(−2)2(−3)2×
1
6
−32−(−2)2

(1)原式=8-14-5+0.25=3;(2)原式=-82+2=-80;(3)原式=152×74×110=2116;(4)原式=25×(34+12-14)=25×1=25;(5)原式=-81×49-49×116=-36-136=-36136;(6)原式=-1-12×13×[2-9]=-1-16×(-7)=-1+76...