问题
解答题
计算下面各题,怎样算简便就怎样算. 9.43-2.6+8.57-3.4 12×(
375+450÷18×2 5(
|
答案
(1)9.43-2.6+8.57-3.4,
=(9.43+8.57)-(2.6+3.4),
=18-6,
=12;
(2)12×(
+1 4
-1 6
),1 3
=12×
+12×1 4
-12×1 6
,1 3
=3+2-4,
=5-4,
=1;
(3)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(4)(
+4 5
)÷1 4
+7 3
,7 10
=
÷21 20
+7 3
,7 10
=
+9 20
,7 10
=
.23 20