问题
解答题
用简便方法计算 (1)6.35-
(2)
(3)
|
答案
(1)6.35-
+4.65-5 7 2 7
=6.35+4.65-(
+5 7
),2 7
=11-1,
=10;
(2)
÷7+8 13
×1 7
=5 13
=
×8 13
+1 7
×1 7
,5 13
=(
+8 13
)×5 13
,1 7
=1×
,1 7
=
;1 7
(3)
×0.25×3 4
×44 3
=(
×3 4
)×(0.25×4),4 3
=1×1,
=1.