题目内容

看谁算得又准又快．
10-0.9=		 8.2+0.54+0.46=
4
5
-
1
3
=
7
15
11
12
-
5
6
+
1
12
=
3
8
×
2
5
=		 26.26÷26= 4.57+6.43= 7.9×11-7.9=
3.14×32= 3+
3
4
-3+
3
4
=		 10.1×30= 2÷0.2-2=
3
4
×
3
8
=		 1.8×4×0.5= 1.5-1.5×0.2= 578+216=
85.2-3.25= 3.2-
1
2
=
2
9
×81=
1
2
+
1
3
=
分析：根据小数、分数加减乘除法的计算方法进行计算．
8.2+0.54+0.46根据加法结合律进行简算；
7.9×11-7.9根据乘法分配律进行简算；
1.8×4×0.5根据乘法结合律进行简算．
解答：解：
10-0.9=9.1 8.2+0.54+0.46=9.2
4
5
-
1
3
=
7
15
11
12
-
5
6
+
1
12
=
1
6
3
8
×
2
5
=
3
20
 26.26÷26=1.01 4.57+6.43=11 7.9×11-7.9=79
3.14×32=28.26 3+
3
4
-3+
3
4
=1
1
2
 10.1×30=303 2÷0.2-2=8
3
4
×
3
8
=
9
32
 1.8×4×0.5=3.6 1.5-1.5×0.2=1.2 578+216=794
85.2-3.25=81.95 3.2-
1
2
=2.7
2
9
×81=18
1
2
+
1
3
=
5
6
点评：口算时，注意运算符号和数据，然后再进一步计算．
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