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1.直接写出得数。
0.32×8=
1.3×0.6=
2.1×4≈
1.5×80=
2.3×0.02=
7.9×5≈
6×1.4=
12.7÷100=
2.01×0.5≈
15×0.06=
42×0.2=
6.1×80≈
0.25×0.4=
3.15×3=
13.8×4≈
0.32×8=
1.3×0.6=
2.1×4≈
1.5×80=
2.3×0.02=
7.9×5≈
6×1.4=
12.7÷100=
2.01×0.5≈
15×0.06=
42×0.2=
6.1×80≈
0.25×0.4=
3.15×3=
13.8×4≈
答案
1. 2.56
2. 0.78
3. 8
4. 120
5. 0.046
6. 40
7. 8.4
8. 0.127
9. 1
10. 0.9
11. 8.4
12. 480
13. 0.1
14. 9.45
15. 56
2. 0.78
3. 8
4. 120
5. 0.046
6. 40
7. 8.4
8. 0.127
9. 1
10. 0.9
11. 8.4
12. 480
13. 0.1
14. 9.45
15. 56
2. 列竖式计算。
4.96×0.8=
6.53×2.2=
6.7×1.9=
4.96×0.8=
6.53×2.2=
6.7×1.9=
答案
1. 3.968
2. 14.366
3. 12.73
2. 14.366
3. 12.73
3. 递等式计算。(能简算的要简算)
$0.25×0.125×32$
$42.56-(12.56+2.87)$
$2.9×1.1+1.1×1.1$
$35.4×44.2-35.3×44.2$
$0.25×0.125×32$
$42.56-(12.56+2.87)$
$2.9×1.1+1.1×1.1$
$35.4×44.2-35.3×44.2$
答案
1. 0.25×0.125×32=(0.25×4)×(0.125×8)=1×1=1
2. 42.56-(12.56+2.87)=42.56-12.56-2.87=30-2.87=27.13
3. 2.9×1.1+1.1×1.1=1.1×(2.9+1.1)=1.1×4=4.4
4. 35.4×44.2-35.3×44.2=44.2×(35.4-35.3)=44.2×0.1=4.42
2. 42.56-(12.56+2.87)=42.56-12.56-2.87=30-2.87=27.13
3. 2.9×1.1+1.1×1.1=1.1×(2.9+1.1)=1.1×4=4.4
4. 35.4×44.2-35.3×44.2=44.2×(35.4-35.3)=44.2×0.1=4.42
