问题
解答题
脱式计算：
|
答案
①12×（
+2 3
）1 6
=12×
+12×2 3 1 6
=8+2
=10；
②24×
-5 36 3 8
=
-10 3 3 8
=2
；23 24
③
×7 10
÷5 16 21 32
=
×7 10
×32 21 5 16
=
；1 3
④86×4 85
=（85+1）×4 85
=85×
+1×4 85 4 85
=4+4 85
=4
；4 85
⑤
×9 17
+1 7
÷75 17
=
×9 17
+1 7
×5 17 1 7
=（
+9 17
）×5 17 1 7
=
×14 17 1 7
=
； 2 17
⑥
÷（2 5
+3 4
）2 5
=
÷2 5 23 20
=
．8 23