题目内容
| 计算. ①32×18+3060÷36 | ②30
| ③2.75+3
| ||||||||||||||||
④7.8×3.4+7
| ⑤12×(
| ⑥[(4-1
|
①32×18+3060÷36
=576+85,
=661;
②30
-25.7-4.3
=30
-(25.7+4.3),
=30
-30,
=
;
③2.75+3
+10.2+1
=2.75+3.8+10.2+1.25,
=(2.75+1.25)+(3.8+10.2),
=4+14,
=18;
④7.8×3.4+7
+7.8×5
=7.8×3.4+7.8+7.8×5.6,
=7.8×(3.4+5.6+1),
=7.8×10,
=78;
⑤12×(
+
-
)
=12×
+12×
+12×
,
=3+2+4,
=9;
⑥[(4-1
)÷1.2+1
]÷2
=[
÷
+
]÷
,
=[
×
+
]×
,
=[
+
]×
,
=
×
,
=
.
=576+85,
=661;
②30
| 1 |
| 4 |
=30
| 1 |
| 4 |
=30
| 1 |
| 4 |
=
| 1 |
| 4 |
③2.75+3
| 4 |
| 5 |
| 1 |
| 4 |
=2.75+3.8+10.2+1.25,
=(2.75+1.25)+(3.8+10.2),
=4+14,
=18;
④7.8×3.4+7
| 4 |
| 5 |
| 3 |
| 5 |
=7.8×3.4+7.8+7.8×5.6,
=7.8×(3.4+5.6+1),
=7.8×10,
=78;
⑤12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2+4,
=9;
⑥[(4-1
| 13 |
| 15 |
| 1 |
| 3 |
| 1 |
| 3 |
=[
| 32 |
| 15 |
| 6 |
| 5 |
| 4 |
| 3 |
| 7 |
| 3 |
=[
| 32 |
| 15 |
| 5 |
| 6 |
| 4 |
| 3 |
| 3 |
| 7 |
=[
| 16 |
| 9 |
| 12 |
| 9 |
| 3 |
| 7 |
=
| 28 |
| 9 |
| 3 |
| 7 |
=
| 4 |
| 3 |
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