题目内容

35×12＋65×12，计算正确的是

[　　]

A．(35＋12)×65

B．(35＋65)×12

C．(65＋12)×35

答案：B
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计算下面各题．
1.35÷1.5+6.12×0.5 [1.7÷（6.8-6.12）]×8.6 4.8×0.65+0.65×4.2 6.8÷[（4.5-2.8）×0.4]．
直接写出得数．
12.5×0.1= 9.8÷0.01= 3.4+13= 1-0.45= 0.65+0.35= 0.5-0.24=
0.2-0.02= 25÷100= 0.56×1000= 1.8÷3= 0.25×32= 0.4-0.4÷4=
脱式计算，能简算的要简算
（1）
4
5
-
4
5
÷
2
3
×
1
2
　　　　
 （2）(
2
3
+
4
15
)×45　　
（3）12.87+3.65+1.35
（4）74.6×19+19×25.4　
（5）[1-(
3
4
-
1
6
)]÷
2
3
　
（6）168.1÷（4.5×2-0.8）
口算
1
4
×
1
3
=
4
7
÷2=
1
2
÷
1
2
=		 10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6=
8
9
÷4=		 15×
4
5
=		 15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1=
7
15
×5=		 1÷
3
4
=
1
2
÷
1
4
=		 1÷
3
5
=
3
4
×12=
1
5
÷
2
3
=
7
9
×
3
7
=		 1-
3
5
=		 18×
5
6
=		 7÷
7
5
=
1
3
+
1
6
=		 1+
3
5
=
2
9
×
1
4
=
8
3
÷2=
3
5
÷
2
5
=
5
9
÷3=
5
6
×
3
10
=
2
5
÷
1
2
=
8×
1
4
=		 9÷
3
4
=		 30×
1
3
=
4
5
÷2=
5
24
÷
5
6
=
5
8
×
1
2
×0=
1
3
×
3
11
=		 8÷
1
4
=
9
10
÷
3
5
=		 0÷
1
3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
=		 0÷
5
12
=		 1×
1
2
÷
1
2
=
解方程或解比例
①
6
x
=
10
7
 ②3：8=24：x ③
3
4
：
9
10
=x：
3
5
 ④
12.5
2.5
=
x
8
⑤x-
3
5
x=
6
5
 ⑥0.25+25%x=1.5； ⑦
1
2
X-
4
5
=
1
5
 ⑧4.5x-
1
2
x=6．

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