问题
解答题
(1)36×(
(2)[
(3)51×
(4){1-[
(5)30
|
答案
(1)36×(
+5 9
-3 4
),11 8
=36×
+36×5 9
-36×3 4
,11 8
=20+27-49.5,
=-2.5;
(2)[
-(1 2
×3 8
+11 12
×3 8
)]÷1 12
,3 4
=[
-1 2
×(3 8
+11 12
)],1 12
=[
-1 2
],3 8
=
;1 8
(3)51×
,40 50
=50×
+1×40 50
,40 50
=40+
,4 5
=40
;4 5
(4){1-[
+1 5
÷(7 10
+1 2
)]}×3 8
,1 2
={1-[
+1 5
÷7 10
]}×7 8
,1 2
={1-[
+1 5
]}×4 5
,1 2
={1-1}×
,1 2
=0×
,1 2
=0;
(5)30
×1 28
,28 29
=29×
+1×28 29
+28 29
×1 28
,28 29
=28+(
+28 29
),1 29
=28+1,
=29.