北师大版小学数学四年级下册计算题题库.doc
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小数乘法
小数加、减法
结合律:
(a+b)+c=a+(b+c)
(a×b)×c=a×(b×c)
乘法分配律
a×(b+c)=a×b+a×c
a×b+a×c=a×(b+c)
脱式计算
(按照运算顺序)
1.14×0.7=4.5×28=7.4×20=6.2×1.4=
5.4×2.6=
26.8+3.02=6.07-4.993=3.7+2.36=15.4+2.97=10.2-8.75=
2.5×1.9×4
42×1.25×0.08
6.9+4.8+3.10.6+6.22+3.78
25×0.23×0.4
(40+0.8)×2.5
12.5×(0.8+80)
30×(1.5+0.1)
3.25×23-3.25×130.28×18-8×0.28
12.83-(8.45-3.69) 100-(8.7+5.24)
84.06+6.47-5.19 5.43+(15.27+30.29)
2.8×1.43+0.57
2.3×1.4=3.7×1.8=5.2×1.6=
3.6×0.8=0.66×1.4=
7.3-2.25=3.8+3.54=3.05-2.9=3.1-2.07=12.7+6.58=
1.2×0.04×25
320×1.25×8
18.76-3.47-0.535.17-1.8-3.2
0.4×23×2.5
0.36×34+0.36×66
7.5×2.3+2.5×2.3
(1.25-0.125)×8
4.5×5.2+4.5×4.8
7.64×2.5-3.64×2.5
5.03-2.5+0.9622.8-5.23-9.25
9.29+3.7×6.3
8.02-5.4+0.98
4.6×57+0.23×8
0.42×0.8=0.24×0.19=2.4×1.3=4.5×2.3=
0.72×0.27=
28-3.56=10-0.81=10-0.36=20-0.92=8-7.089=
0.25×21×40
1.25×21×0.8
4.02+5.4+0.985.17-1.8-3.23.68+7.56-2.68
6.3×43+57×6.3
17.01×9+17.01
9.71×2.3+7.7×9.71
(100-0.4)×2.5
10×(5.2+12.3)
67.2+41.5-71.39
10.75+(0.4+9.4)16.23+8.92-7.5650-28.5×1.2
13.79-9.53+10.57
45×1.2=107×4.6=
76×0.37=0.28×0.27=0.75×0.42=
96.85-85=45.45-45=
10-0.41=45-0.45=3.57+3=
0.13×25×0.4
(24×2.5)×0.04
70.8-1.25-1.75
4.02-3.5+0.984.25-0.83+0.75
(2.5-0.25)×0.4
7.9×10.8-0.8×7.9
18.76×9.9+18.76
(8+0.8)×12.5
26×15.7+15.7×24
1.5+0.68-0.672.8-8.6+5.84
20.8-(15.98-3.9)32.5+(5.07+6.1)3.52-(4.6-3.82)
5.61×2.9=3.77×1.8=0.02×96=5.22×0.3=
9.99×0.89=
5.8-3.25=4.8+18.09=10.3+58.7=8.3-4.56=9.03-8.5=
12.5×0.35×8
25×3.1×0.4
48.14-2.43-7.57
4×2.3×2.5
0.5×15.8×0.2
4.8×7.8+7.8×0.52
27.5×3.7-7.5×3.7
(0.8+8)×12.5
2.5×0.6-1.5×0.6
2.5×(40-0.4)
3.2×0.36-4.80.56+6.2+3.78
45×21-50×2.1
5.45+2.65×2.2
0.65×90+4.2
5.63×70=
75.6×90=
80×0.78=
8.06×0.04=
1.33×8.9=
5.94+10.7=12.3+0.85=37.8+3.02=0.704-0.25=10.1-0.55=
48×0.5×0.4
47×50×0.2
4×6.32×2.5
12.5×2.5×0.8×4
0.25×12.8×0.4
0.93×6+0.93×4
(0.4+10)×2.53.25×23-3.25×130.28×18-8×0.28
1.25×(100+0.8)
50.4×1.9-1.8
72×0.81+10.4
12.4-4.09×1.3
3.2×(14.7-7.65)
3.76+0.25+0.4
0.68×0.77=
45.6×0.26=
9.57×0.21=
38×6.75=
7.04×7.8=
4.1+2.53=5.07-0.8=5.7-0.73=13.18+5.27=5.16+7.9=
1.25×26×80
7.62+2.6+2.38
12-0.28-0.72
0.25×12.9×0.4
0.25×32×12.5
3.65×88+3.65×12
0.125×(8+0.8)
2.5×(10+0.4)
0.27×5.6+4.4×0.27
(0.4+40)×2.5
23.66+4.34-3.56
5.6-0.81-1.2915.9+3.26+4.17
5.83×2+4.27
1.3+4.7×0.9
1.42×0.25=
4.06×0.06=
60.5×2.1=
20×0.78=
2.64×0.2=
1.4-0.55=3.6+0.46=43.5-27.34=15.08-3.9=75.6-3.55=
20.15+7.62+7.8551.27-8.66-1.34
8×(1.25×12)
0.25×4.7×40
(0.4×0.02)×2.5
33.3×19+33.3
2.9×2.5+17.1×2.5
(8+0.8)×12.5
2.5×12.4-2.4×2.5
(1.25-0.125)×8
6.9-4.8+3.1
9.29+3.7-6.3
8.2-5.4-0.98
6.4×0.25+3.6×4
0.6+0.4×5.5