问题
解答题
计算: (1)
(2)(
(3)(2
(4)
|
答案
(1)原式=1 2
×310
-15 1 2
×510 6
=3 2
-10×15 5 2 10×6
=15 2
-56
.15
(2)原式=
÷x3y
-3xy÷xy
+xy
÷xy3 xy
=x-3
+y.xy
(3)原式=2
×33
-22
×3-2×33
-2×32
+62
=6
-66
-63
+6.2
(4)原式=
-12
÷2-3
÷3 3
=2
-23
+3=3.3