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1 直接写出得数。(每题1分,共20分)
$2.7 + 4.1 =$ $3.4 + 0.5 =$ $1.8 + 5.2 =$ $2.6 + 5.1 =$
$8.8 - 6.3 =$ $8 - 5.4 =$ $1.1 - 0.3 =$ $6.8 - 2.9 =$
$3.1 + 1.5 =$ $0.2 + 0.9 =$ $1.6 - 0.8 =$ $8.1 - 1.8 =$
$0.9 + 0.1 =$ $6.5 - 2.2 =$ $7.2 + 0.5 =$ $0.9 - 0.3 =$
$7.2 + 5 =$ $9 - 0.3 =$ $2.6 + 0.7 =$ $2.6 - 0.7 =$
$2.7 + 4.1 =$ $3.4 + 0.5 =$ $1.8 + 5.2 =$ $2.6 + 5.1 =$
$8.8 - 6.3 =$ $8 - 5.4 =$ $1.1 - 0.3 =$ $6.8 - 2.9 =$
$3.1 + 1.5 =$ $0.2 + 0.9 =$ $1.6 - 0.8 =$ $8.1 - 1.8 =$
$0.9 + 0.1 =$ $6.5 - 2.2 =$ $7.2 + 0.5 =$ $0.9 - 0.3 =$
$7.2 + 5 =$ $9 - 0.3 =$ $2.6 + 0.7 =$ $2.6 - 0.7 =$
答案
6.8 3.9 7 7.7
2.5 2.6 0.8 3.9
4.6 1.1 0.8 6.3
1 4.3 7.7 0.6
12.2 8.7 3.3 1.9
2.5 2.6 0.8 3.9
4.6 1.1 0.8 6.3
1 4.3 7.7 0.6
12.2 8.7 3.3 1.9
2 列竖式计算。(每题3分,共18分)
$3.9 + 6.6 =$ $5.2 - 2.5 =$ $1.3 + 0.8 =$
$6.5 - 2 =$ $1.6 + 1.4 =$ $3 - 0.2 =$
$3.9 + 6.6 =$ $5.2 - 2.5 =$ $1.3 + 0.8 =$
$6.5 - 2 =$ $1.6 + 1.4 =$ $3 - 0.2 =$
答案
竖式略
10.5 2.7 2.1
4.5 3 2.8
10.5 2.7 2.1
4.5 3 2.8
3 递等式计算。(每题4分,共12分)
$1.2 + 5.1 - 1.5$ $8 - 1.8 + 0.9$ $5×(0.3 + 8.7)$
$1.2 + 5.1 - 1.5$ $8 - 1.8 + 0.9$ $5×(0.3 + 8.7)$
答案
4.8 7.1 45
