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1、1、直接寫出得數(shù).
0.452.5=
0.81.25=
0.33.6=
0.30.3=
100.07=
0.31.4=
0.057=
0.920.4=
0.20.26=
0.144=
0.020.1=
1.20.3=
0.20.4=
8.2+1.8=
100-35.22=
2.34=
2.50.4=
2.45=
0.224=
3.250=
0.9-0.52=
3.991=
03.52=
12.58=
810 =
10-1.8-7.2=
0.43+3.57=
2.5412=
0.90.8=
7.5x
2、-3x =
a+3a+7a==
1.05100=
10.5=
0.963=
1.470.7=
5.46=
0.16.510=
0.56100=
3.78100=
40.8 =
3.215100=
0.810=
4.08100=
1.10.2 =
0.60.8 =
30.9=
2.50.4=
3.60.4=
12.58=
500.04=
800.3 =
1.19=
0.165 =
1.78+2.2 =
9.60.6 =
1.20.5-0.4 =
0.70.01 =
2.50.4 =
12-3.9=
1.25
3、81.25 =
6.60.66 =
5.370+4.63 =
3.9+2.03=
4.23.5=
1.6+2.40.3 =
2.14-0.9=
27+456+73=
0.30.3=
7.2+2.8=
0.90.01=
120.3=
2.870.7=
134=
0.960.3=
1.50.4=
70.25=
2.50.70.8=
8-2.5=
161.6=
5.61.01=
8(2.5+0.25)=
0.36+0.64=
64.3216=
4.20.1=
72.80.8=
8.44.2=
13.8+
4、9.9=
2.42.5=
0.050.8=
2.56-0.37=
1.250.80.5=
122.5=
1.233=
3.21.6=
3.5+3.53=
19.62=
8.82.2=
0.754=
(1.5+0.25)4=
0.50.8=
8.40.2=
1.60.2=
7.20.3=
2.80.3=
0.90.15=
1.80.4=
5.50.55=
0.08100=
2.20.11=
5.46+4.54=
12.50.8=
0.350.3=
1.45=
2.84=
19.64=
22.54=
5、
2、用豎式計(jì)算
0.3961.2=
0.7560.36=
15.613=
0.1815=
0.02514=
3.0636=
0.040.12=
3.842.6≈
5.763=(保留一位小數(shù))
7.1522 90
.753.3
3.680.25
16.90.13
1.553.9
3.70.016
13.760.8=
5.20.6
8.41.3
6.40.5
4.480.4
5.255
35.44.2
0.0420.54
0.760.32
0.250.046
2.523.4
1.0825
0.120.50.16
6、=
4.80.25=
0.1251.4≈(保留兩位小數(shù))
2.50.7= (保留三位小數(shù))
10.13.3= (商用循環(huán)小數(shù))
10.7512.5= (用乘法驗(yàn)算)
3.259.04= (用除法驗(yàn)算)
3、脫式計(jì)算(能簡算的要簡算)
2.57.14
16.1299+16.12
5.20.9+0.9
7.2899+7.28
4.3500.2
64-2.640.5
2615.7+15.724
(2.275 +0.625)0.28
3.94+34.30.2
1.2(9.62.4)4.8
8.91.14.7
2.75.43.9
3.69.
7、85-5.46
8.053.4+7.6
6.584.50.9
2.80.5+1.58
32+4.9-0.9
4.8-4.80.5
(1.25-0.125)8
4.8100.1
56.599+56.5
7.0910.8-0.87.09
4.85 + 0.35 1.4
8.7 17.4 - 8.7 7.4
12.50.42.58
0.873.16+4.64
9.5101
0.68 (5.2 -3.5) 1.25
40.5 0.81 0.18
4.8 (15 2.4)
2.13.0.8257
6.81+6.8199
0.2518540
4.40.8-3.40.8
(9.37+9.37+9.37+9.37) 2.5
4.2.1.+1.1.75
2.376.3+2.373.7
2.51.250.32 3.810.1
2.5(3.80.04)
7.69101
3.810.1
0.2539+0.25
0.12572 460.33+540.33
(85.27) 1.25
6.81+6.8199
0.2518540
6.80.750.5
3.750.125–2.75
1.53+23.47.2
9.599
13.50.98
12.58.8