问题
解答题
能简算就要简算.
1.25×7×0.8 7.28-3.14+2.72-2.86. |
答案
(1)
×5 8
+11 10
÷3 8
,10 11
=
×5 8
+11 10
×3 8
,11 10
=
×(11 10
+5 8
),3 8
=
×1,11 10
=1
;1 10
(2)1.25×7×0.8,
=1.25×0.8×7,
=1×7,
=7;
(3)7.28-3.14+2.72-2.86,
=(7.28+2.72)-(3.14+2.86),
=10-6,
=4.