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1.直接写出得数。
$2.7+1.33=$
$2.5+3.42=$
$0.25+1.21=$
$6.13+7.97=$
$11.5-5.4=$
$0.95-0.5=$
$15.5-5.2=$
$3.26-1.54=$
$32.8+8=$
$18.35+7.25=$
$12.6+4.8=$
$5.9+4.8=$
$2.4-1.6=$
$0.76+9.24=$
$8.4-1.7=$
$2.7+1.33=$
$2.5+3.42=$
$0.25+1.21=$
$6.13+7.97=$
$11.5-5.4=$
$0.95-0.5=$
$15.5-5.2=$
$3.26-1.54=$
$32.8+8=$
$18.35+7.25=$
$12.6+4.8=$
$5.9+4.8=$
$2.4-1.6=$
$0.76+9.24=$
$8.4-1.7=$
答案
1. 4.03
2. 5.92
3. 1.46
4. 14.1
5. 6.1
6. 0.45
7. 10.3
8. 1.72
9. 40.8
10. 25.6
11. 17.4
12. 10.7
13. 0.8
14. 10
15. 6.7
2. 5.92
3. 1.46
4. 14.1
5. 6.1
6. 0.45
7. 10.3
8. 1.72
9. 40.8
10. 25.6
11. 17.4
12. 10.7
13. 0.8
14. 10
15. 6.7
2. 比一比，算一算。
$18.29 - 1.64 - 8.36$
$18.29 - (1.64 + 8.36)$
$5.25 - 3.6 + 4.75$
$5.25 + 4.75 - 3.6$
$18.29 - 1.64 - 8.36$
$18.29 - (1.64 + 8.36)$
$5.25 - 3.6 + 4.75$
$5.25 + 4.75 - 3.6$
答案
1. $18.29-1.64-8.36=16.65-8.36=8.29$
2. $18.29-(1.64+8.36)=18.29-10=8.29$
3. $5.25-3.6+4.75=1.65+4.75=6.4$
4. $5.25+4.75-3.6=10-3.6=6.4$
2. $18.29-(1.64+8.36)=18.29-10=8.29$
3. $5.25-3.6+4.75=1.65+4.75=6.4$
4. $5.25+4.75-3.6=10-3.6=6.4$
3. 递等式计算。(能简算的要简算)
3.8+1.42-2.35
28.6-3.47-6.53
7.41-(2.96+3.04)
5.21+6.93-4.21
3.8+1.42-2.35
28.6-3.47-6.53
7.41-(2.96+3.04)
5.21+6.93-4.21
答案
1. $3.8+1.42-2.35=5.22-2.35=2.87$
2. $28.6-3.47-6.53=28.6-(3.47+6.53)=28.6-10=18.6$
3. $7.41-(2.96+3.04)=7.41-6=1.41$
4. $5.21+6.93-4.21=5.21-4.21+6.93=1+6.93=7.93$
2. $28.6-3.47-6.53=28.6-(3.47+6.53)=28.6-10=18.6$
3. $7.41-(2.96+3.04)=7.41-6=1.41$
4. $5.21+6.93-4.21=5.21-4.21+6.93=1+6.93=7.93$
