题目内容
脱式计算.(能简算的要简算)
×
+
×
(
+
)×88
×
×
×
×15×21.
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 5 |
(
| 5 |
| 11 |
| 7 |
| 44 |
| 5 |
| 8 |
| 12 |
| 31 |
| 8 |
| 5 |
| 4 |
| 5 |
| 6 |
| 7 |
(1)
×
+
×
=(
+
)×
=1×
=
;
(2)(
+
)×88
=
×88+
×88
=40+14
=54;
(3)
×
×
=(
×
)×
=1×
=
;
(4)
×
×15×21
=(
×15)×(
×21)
=12×18
=216.
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 5 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
=1×
| 1 |
| 4 |
=
| 1 |
| 4 |
(2)(
| 5 |
| 11 |
| 7 |
| 44 |
=
| 5 |
| 11 |
| 7 |
| 44 |
=40+14
=54;
(3)
| 5 |
| 8 |
| 12 |
| 31 |
| 8 |
| 5 |
=(
| 5 |
| 8 |
| 8 |
| 5 |
| 12 |
| 31 |
=1×
| 12 |
| 31 |
=
| 12 |
| 31 |
(4)
| 4 |
| 5 |
| 6 |
| 7 |
=(
| 4 |
| 5 |
| 6 |
| 7 |
=12×18
=216.
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