问题
解答题
|
答案
(1)76×99,
=76×(100-1),
=76×100-76,
=7600-76,
=7524;
(2)36×(
+5 9
-1 4
),1 2
=36×
+36×5 9
-36×1 4
,1 2
=20+9-18,
=11;
(3)(
+2 3
÷1 2
)×3 4
,1 4
=(
+2 3
×1 2
)×4 3
,1 4
=(
+2 3
)×2 3
,1 4
=
×4 3
,1 4
=
;1 3
(4)4.05-1.8-1.2,
=4.05-(1.8+1.2),
=4.05-3,
=1.05;
(5)125×32×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(6)(
+4 5
)÷1 4
-7 3
.9 20
=
×21 20
-3 7
,9 20
=
-9 20
,9 20
=0.