问题
解答题
用简便方法计算下列各题
|
答案
(1)7
+35 6
+29 10
+61 6
,1 10
=(7
+25 6
)+(31 6
+69 10
),1 10
=10+10,
=20;
(2)
÷7+8 13
×1 7
,6 13
=
×8 13
+1 7
×1 7
,6 13
=
×(1 7
+8 13
),6 13
=
×1 7
,14 13
=
;2 13
(3)2.5×0.125×80×4,
=(2.5×4)×(0.125×80),
=10×10,
=100.