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1. 直接写出得数。
0.8+2.6=
4.4+4.6=
7.58+0.52=
4.4÷1.1×10=
9.6-0.8=
2.9-1.8=
20÷0.4=
0.84÷4×0.2=
4.3×10=
0.8×9=
7.2×0.2=
3.8÷1.9×100=
7.8÷0.6=
2.03×4=
0.3×0.1=
5.2÷100×0.1=
2.6÷10=
16.8÷0.4=
4.3×0.2=
9.1÷0.7÷13=
3.6×2=
11.2-3.6=
9.8÷0.49=
7.02×0.1÷2=
0.2×60=
0.13×7=
0.72÷2.4=
4-3.5×0.1=
4.8÷48=
2÷0.125=
8.2÷0.01=
(4.25+2.75)÷0.2=
0.8+2.6=
3.4
4.4+4.6=
9
7.58+0.52=
8.1
4.4÷1.1×10=
40
9.6-0.8=
8.8
2.9-1.8=
1.1
20÷0.4=
50
0.84÷4×0.2=
0.042
4.3×10=
43
0.8×9=
7.2
7.2×0.2=
1.44
3.8÷1.9×100=
200
7.8÷0.6=
13
2.03×4=
8.12
0.3×0.1=
0.03
5.2÷100×0.1=
0.0052
2.6÷10=
0.26
16.8÷0.4=
42
4.3×0.2=
0.86
9.1÷0.7÷13=
1
3.6×2=
7.2
11.2-3.6=
7.6
9.8÷0.49=
20
7.02×0.1÷2=
0.351
0.2×60=
12
0.13×7=
0.91
0.72÷2.4=
0.3
4-3.5×0.1=
3.65
4.8÷48=
0.1
2÷0.125=
16
8.2÷0.01=
820
(4.25+2.75)÷0.2=
35
答案
3.4 9 8.1 40 8.8 1.1 50 0.042 43 7.2 1.44 200 13 8.12 0.03 0.0052 0.26 42 0.86 1 7.2 7.6 20 0.351 12 0.91 0.3 3.65 0.1 16 820 35
2. 用简便方法计算。
5.7-3.79+14.3-6.21
0.125×32
1.35×8.4-0.35×8.4
2.6×1.02
(9.5-3.8)÷2.5÷4
3.14-(2.14+4×0.22)
5.7-3.79+14.3-6.21
0.125×32
1.35×8.4-0.35×8.4
2.6×1.02
(9.5-3.8)÷2.5÷4
3.14-(2.14+4×0.22)
答案
10 4 8.4 2.652 0.57 0.12
解析
5.7-3.79+14.3-6.21
=(5.7+14.3)-(3.79+6.21)
=20-10
=10
0.125×32
=0.125×8×4
=1×4
=4
1.35×8.4-0.35×8.4
=(1.35-0.35)×8.4
=1×8.4
=8.4
2.6×1.02
=2.6×(1+0.02)
=2.6×1+2.6×0.02
=2.6+0.052
=2.652
(9.5-3.8)÷2.5÷4
=5.7÷(2.5×4)
=5.7÷10
=0.57
3.14-(2.14+4×0.22)
=3.14-(2.14+0.88)
=3.14-3.02
=0.12
=(5.7+14.3)-(3.79+6.21)
=20-10
=10
0.125×32
=0.125×8×4
=1×4
=4
1.35×8.4-0.35×8.4
=(1.35-0.35)×8.4
=1×8.4
=8.4
2.6×1.02
=2.6×(1+0.02)
=2.6×1+2.6×0.02
=2.6+0.052
=2.652
(9.5-3.8)÷2.5÷4
=5.7÷(2.5×4)
=5.7÷10
=0.57
3.14-(2.14+4×0.22)
=3.14-(2.14+0.88)
=3.14-3.02
=0.12
巧算:$11×12.12-12×11.11$。
答案
原式=11×12×1.01-12×11×1.01=0
解析
原式$=11×12×1.01 - 12×11×1.01$
$=0$
$=0$
