问题
解答题
|
答案
①31.9×18-8×31.9,
=31.9×(18-8),
=31.9×10,
=319;
②
-13 14
+13 15
-1 14
,2 15
=(
+13 14
)-(1 14
+2 15
),13 15
=1-1,
=0;
③
×1.4+2 5
,2 5
=(1.4+1)×0.4,
=2.4×0.4,
=0.96.
|
①31.9×18-8×31.9,
=31.9×(18-8),
=31.9×10,
=319;
②
-13 14
+13 15
-1 14
,2 15
=(
+13 14
)-(1 14
+2 15
),13 15
=1-1,
=0;
③
×1.4+2 5
,2 5
=(1.4+1)×0.4,
=2.4×0.4,
=0.96.