问题
解答题
简便计算. 8×7.3+8×2.7 3
|
答案
(1)8×7.3+8×2.7,
=8×(7.3+2.7),
=8×10,
=80;
(2)3
-5 6
-2 5
,3 5
=3
-(5 6
+2 5
),3 5
=3
-1,5 6
=2
;5 6
(3)
+5 6
+8 17
+1 6
,9 17
=(
+5 6
)+(1 6
+8 17
),9 17
=1+1,
=2;
(4)
+2 5
-5 7
+2 5
,5 7
=(
-2 5
)+(2 5
+5 7
),5 7
=0+
,10 7
=1
.3 7