题目内容

计算.
①32×18+3060÷36
②30
1
4
-25.7-4.3
③2.75+3
4
5
+10.2+1
1
4
④7.8×3.4+7
4
5
+7.8×5
3
5
⑤12×(
1
4
+
1
6
-
1
3
⑥[(4-1
13
15
)÷1.2+1
1
3
]÷2
1
3
①32×18+3060÷36
=576+85,
=661;

②30
1
4
-25.7-4.3

=30
1
4
-(25.7+4.3),
=30
1
4
-30,
=
1
4


③2.75+3
4
5
+10.2+1
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
+7.8×5
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
+12×
1
6
+12×
1
3

=3+2+4,
=9;

⑥[(4-1
13
15
)÷1.2+1
1
3
]÷2
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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