【计算题专项练习】人教版四年级数学下册第六单元05：小数加减混合运算（含答案与解析）

2025-2026学年四年级数学下册人教版第六单元计算专项05：小数加减混合运算日期：日期：用时：评价：一、不含括号的小数加减混合运算（基础巩固）(1)1.2+3.5-2.1 (2)5.6-2.3+4.7(3)0.8+2.4+3.6 (4)7.5-3.2-1.8(5)2.15+3.85-4.5 (6)6.4-1.7+2.3(7)0.5+1.5+2.5 (8)9.3-4.6-2.7(9)3.6+2.8-1.9 (10)8.2-5.5+3.1(11)1.05+2.95+0.5 (12)7.8-3.4-2.6二、含进位退位的小数加减混合运算（能力提升）(1)3.25+1.75-2.4 (2)8.6-3.12+2.58(3)4.08+2.92+1.5 (4)10.5-6.75-2.25(5)2.3+5.78-3.08 (6)9.45-4.6+3.55(7)0.75+1.25+3.6 (8)12.8-5.32-4.68(9)5.6+3.45-2.05 (10)7.3-2.8+1.9(11)3.18+4.82-5.2 (12)11.2-6.55+4.85三、含括号的小数加减混合运算（顺序强化）(1)（2.5+3.8）-1.6 (2)7.2-（1.3+2.7）(3)（0.9+1.1）+4.5 (4)10-（3.6+2.4）(5)（5.25+2.75）-3.5 (6)8.5-（2.1-0.5）(7)（3.4+4.6）+2.8 (8)15-（6.2+3.8）(9)（1.8+2.2）-0.5 (10)6.7-（3.2-1.3）(11)（4.55+5.45）+1.2 (12)9.3-（2.8+3.5）四、综合混合运算（综合应用）(1)4.5+（6.2-3.7）+2.1 (2)9.8-（2.5+3.3）-1.2(3)（1.25+2.75）+（3.5-1.5） (4)7.6-（1.8+2.2）+3.4(5)3.2+（5.8-2.3）-1.7 (6)12.5-（4.6-1.5）+3.1(7)（0.8+1.2）+（4.3-2.3） (8)8.4-（3.1+2.9）-0.4(9)5.1+（6.9-3.4）+2.5 (10)10.2-（2.8+3.2）+1.8(11)（2.35+3.65）+（5.2-3.2） (12)13.7-（5.4-2.3）-4.6参考答案一、不含括号的小数加减混合运算（基础巩固）(1)1.2+3.5-2.1

=4.7-2.1

=2.6(2)5.6-2.3+4.7

=3.3+4.7

=8(3)0.8+2.4+3.6

=3.2+3.6

=6.8(4)7.5-3.2-1.8

=4.3-1.8

=2.5(5)2.15+3.85-4.5

=6-4.5

=1.5(6)6.4-1.7+2.3

=4.7+2.3

=7(7)0.5+1.5+2.5

=2+2.5

=4.5(8)9.3-4.6-2.7

=4.7-2.7

=2(9)3.6+2.8-1.9

=6.4-1.9

=4.5(10)8.2-5.5+3.1

=2.7+3.1

=5.8(11)1.05+2.95+0.5

=4+0.5

=4.5(12)7.8-3.4-2.6

=4.4-2.6

=1.8二、含进位退位的小数加减混合运算（能力提升）(1)3.25+1.75-2.4

=5-2.4

=2.6(2)8.6-3.12+2.58

=5.48+2.58

=8.06(3)4.08+2.92+1.5

=7+1.5

=8.5(4)10.5-6.75-2.25

=3.75-2.25

=1.5(5)2.3+5.78-3.08

=8.08-3.08

=5(6)9.45-4.6+3.55

=4.85+3.55

=8.4(7)0.75+1.25+3.6

=2+3.6

=5.6(8)12.8-5.32-4.68

=7.48-4.68

=2.8(9)5.6+3.45-2.05

=9.05-2.05

=7(10)7.3-2.8+1.9

=4.5+1.9

=6.4(11)3.18+4.82-5.2

=8-5.2

=2.8(12)11.2-6.55+4.85

=4.65+4.85

=9.5三、含括号的小数加减混合运算（顺序强化）(1)（2.5+3.8）-1.6

=6.3-1.6

=4.7(2)7.2-（1.3+2.7）

=7.2-4

=3.2(3)（0.9+1.1）+4.5

=2+4.5

=6.5(4)10-（3.6+2.4）

=10-6

=4(5)（5.25+2.75）-3.5

=8-3.5

=4.5(6)8.5-（2.1-0.5）

=8.5-1.6

=6.9(7)（3.4+4.6）+2.8

=8+2.8

=10.8(8)15-（6.2+3.8）

=15-10

=5(9)（1.8+2.2）-0.5

=4-0.5

=3.5(10)6.7-（3.2-1.3）

=6.7-1.9

=4.8(11)（4.55+5.45）+1.2

=10+1.2

=11.2(12)9.3-（2.8+3.5）

=9.3-6.3

=3四、综合混合运算（综合应用）(1)4.5+（6.2-3.7）+2.1

=4.5+2.5+2.1

=7+2.1

=9.1(2)9.8-（2.5+3.3）-1.2

=9.8-5.8-1.2

=4-1.2

=2.8(3)（1.25+2.75）+（3.5-1.5）

=4+2

=6(4)7.6-（1.8+2.2）+3.4

=7.6-4+3.4

=3.6+3.4

=7(5)3.2+（5.8-2.3）-1.7

=3.2+3.5-1.7

=6.7-1.7

=5(6)12.5-（4.6-1.5）+3.1

=12.5-3.1+3.1

=9.4+3.1

=12.5(7)（0.8+1.2）+（4.3-2.3）

=2+2

=4(8)8.4-（3.1+2.9）-0.4

=8.4-6-0.4

=2.4-0.4

=2(9)5.1+（6.9-3.4）+2.5

=5.1+3.5+2.5

=8.6+2.5

=11.