题目内容
| 脱式计算.(能简算要简算的) ①2×3.6+3.6×7+3.6 | ②1.25×32×25 | ||||||||||||
| ③5.42-(3.75-0.58) | ④34.7-
| ||||||||||||
⑤
| ⑥23×
|
①2×3.6+3.6×7+3.6,
=3.6×(2+7+1),
=3.6×10,
=36;
②1.25×32×25,
=(1.25×8)×(25×4),
=10×100,
=1000;
③5.42-(3.75-0.58),
=(5.42+0.58)-3.75,
=6-3.75,
=2.25;
④34.7-
+65.3-
,
=(34.7+65.3)-(
+
),
=100-1,
=99;
⑤
×
×1
×1
,
=(
×
)×(
×
),
=1×1,
=1;
⑥23×
+57÷
,
=23×
+57×
,
=(23+57)×
,
=80×
,
=30.
=3.6×(2+7+1),
=3.6×10,
=36;
②1.25×32×25,
=(1.25×8)×(25×4),
=10×100,
=1000;
③5.42-(3.75-0.58),
=(5.42+0.58)-3.75,
=6-3.75,
=2.25;
④34.7-
| 7 |
| 15 |
| 8 |
| 15 |
=(34.7+65.3)-(
| 7 |
| 15 |
| 8 |
| 15 |
=100-1,
=99;
⑤
| 7 |
| 8 |
| 11 |
| 15 |
| 1 |
| 7 |
| 4 |
| 11 |
=(
| 7 |
| 8 |
| 8 |
| 7 |
| 11 |
| 15 |
| 15 |
| 11 |
=1×1,
=1;
⑥23×
| 3 |
| 8 |
| 8 |
| 3 |
=23×
| 3 |
| 8 |
| 3 |
| 8 |
=(23+57)×
| 3 |
| 8 |
=80×
| 3 |
| 8 |
=30.
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