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口算:
26.26÷26=
4.57+6.43= 7.9×11-7.9= 3.14×32=
3+
3
4
-3+
3
4
=
0.1×30%= 2÷1%-2=
3
4
÷
3
8
=
1.8×4×0.5= 1.5-1.5×0.3= 5.7+4.3= 1-25%=
18×
2
9
=
6
7
×
7
9
=
3.6÷12= 18÷
2
9
=
11
12
÷22=
5
8
÷5=
3
10
÷1=
1-0.6=
0.92-0.2= 0.52+0.4= 0.72÷0.9= 0÷0.24=
3.3÷0.1= 1÷0.25= 0.6×5= 0.2×0.4=
0.25×36=
3
8
×3=
3
4
×12=
4
7
=
1
2
÷
2
3
=
4
5
÷
6
5
=
10÷
2
5
=
3.5+47=
0.4×12×25= 10×
2
5
=
260-48-52= 3.6÷12=
18÷
2
9
=
5.7+4.3= 0.25×36=
3
8
×3=
0.4×12×25=
分析:(1)(2)(3)(4)(6)(9)(10)(11)(15)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(36)(37)(40)(42)(43)(45)依据小数四则运算计算方法解答,
剩余的按照分数四则运算计算方法解答.
解答:
解: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
=1.5;
0.1×30%=0.03; 2÷1%-2=198;
3
4
÷
3
8
=2;
1.8×4×0.5=3.6; 1.5-1.5×0.3=1.05; 5.7+4.3=10; 1-25%=0.75;
18×
2
9
=4;
6
7
×
7
9
=
2
3
3.6÷12=0.3; 18÷
2
9
=81;
11
12
÷22=
1
24
5
8
÷5=0.125;
3
10
÷1=0.3;
1-0.6=0.4;
0.92-0.2=0.72; 0.52+0.4=0.92; 0.72÷0.9=0.8; 0÷0.24=0;
3.3÷0.1=33; 1÷0.25=4; 0.6×5=3; 0.2×0.4=0.08;
0.25×36=9;
3
8
×3=1.125;
3
4
×12=9;
4
7
=7;
1
2
÷
2
3
=0.75;
4
5
÷
6
5
=
2
3
10÷
2
5
=25;
3.5+47=50.5;
0.4×12×25=120; 10×
2
5
=4;
260-48-52=160; 3.6÷12=0.3;
18÷
2
9
=81;
5.7+4.3=10; 0.25×36=9;
3
8
×3=0.125;
0.4×12×25=120.
故答案依次为:1.01,11,79,28.26,1.5,0.03,198,2,3.6,1.05,10,0.75,4,
2
3
,0.3,81,
1
24
,0.125,0.3,0.4,0.72,0.92,0.8,0,33,4,3,0.08,9,1.125,9,7,0.75,
2
3
,25,50.5,120,4,160,0.3,81,10,9,0.125,120.
点评:本题主要考查学生运用四则运算计算方法解决问题的能力.
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