问题
解答题
用简便方法计算 35×102 48×101-48
8.6-
|
答案
(1)35×102,
=35×(100+2),
=35×100+2×35,
=3500+70,
=3570;
(2)48×101-48,
=48×101-48×1,
=48×(101-1),
=48×100,
=4800;
(3)
+8 15
+5 13
+8 13
,7 15
=(
+8 15
)+(7 15
+5 13
),8 13
=1+1,
=2;
(4)8.6-
+1.4-5 9
,4 9
=(8.6+1.4)-(
+5 9
),4 9
=10-1,
=9.