问题
解答题
简算. 13.6-2.8+7.4-7.2 98×2.5
3.5÷8÷0.125. |
答案
(1)13.6-2.8+7.4-7.2,
=13.6+7.4-(2.8+7.2),
=21-10,
=11;
(2)98×2.5,
=(100-2)×2.5,
=250-5,
=245;
(3)
÷23+8 17
×1 23
,9 17
=
×8 17
+1 23
×1 23
,9 17
=
×(1 23
+9 17
),8 17
=
×1,1 23
=
;1 23
(4)3.5÷8÷0.125,
=3.5÷(8×0.125),
=3.5÷1,
=3.5.