2026年暑假作业四年级数学北师大版安徽少年儿童出版社第21页答案
1 直接写得数。
10.7 - 5.7 =
0.03 + 100 =
1.1 + 0.09 =
3 - 1.6 =
8 - 3.5 =
4.6 + 4 =

答案

10.7 - 5.7 =5
0.03 + 100 =100.03
1.1 + 0.09 =1.19
3 - 1.6 =1.4
8 - 3.5 =4.5
4.6 + 4 =8.6
2 列竖式计算。
$25 - 18.26$
$19.3 + 51.7$
$78.3 + 5.88$
$24.8 - 12.32$

答案

25 - 18.26 =6.74
19.3 + 51.7 =71
78.3 + 5.88 =84.18
24.8 - 12.32 =12.48
3 脱式计算。（能简算的要简算）
$17.43 - 2.8 - 7.2$
$2.5 + 17.93 + 7.5$

答案

17.43-2.8-7.2
=17.43-（2.8+7.2）
=17.43-10
=7.43
2.5+17.93+7.5
=2.5+7.5+17.93
=10+17.93
=27.93