问题
解答题
脱式计算.(能简算的要简算) ①14.8-44.08÷5.8 ②7.5×
③
④3.35×6.4×2+6.7×3.6. |
答案
①14.8-44.08÷5.8,
=14.8-7.6,
=7.2;
②7.5×
+7.5÷2 3
,3 4
=7.5×
+7.5×2 3
,4 3
=7.5×(
+2 3
),4 3
=7.5×2,
=15;
③
+1 4
+3 7
÷4,4 7
=
+1 4
+3 7
×4 7
,1 4
=
+1 4
+3 7
,1 7
=
+(1 4
+3 7
),1 7
=
+1 4
,4 7
=
;23 28
④3.35×6.4×2+6.7×3.6,
=(3.35×2)×6.4+6.7×3.6,
=6.7×6.4+6.7×3.6,
=6.7×(6.4+3.6),
=6.7×10,
=67.