3. 甲数是 0.9,比乙数多 0.15,甲、乙两数的和是(
A.0.75
B.1.05
C.1.2
D.1.65
D
)。A.0.75
B.1.05
C.1.2
D.1.65
答案
3. D
4. 两个数的差是 4.5,如果被减数减少 0.6,减数增加 1.4,差是(
A.2.5
B.3.7
C.5.3
D.6.5
A
)。A.2.5
B.3.7
C.5.3
D.6.5
答案
4. A
1. 直接写出得数。
0.3 + 8.7 = 7.8 + 1.6 = 3.8 + 0.12 = 1.4 - 0.9 =
2.5 - 0.5 = 3.8 - 1.4 = 0.99 + 0.1 = 10 - 9.2 =
0.3 + 8.7 = 7.8 + 1.6 = 3.8 + 0.12 = 1.4 - 0.9 =
2.5 - 0.5 = 3.8 - 1.4 = 0.99 + 0.1 = 10 - 9.2 =
答案
0.3 + 8.7 = 9
7.8 + 1.6 = 9.4
3.8 + 0.12 = 3.92
1.4 - 0.9 = 0.5
2.5 - 0.5 = 2
3.8 - 1.4 = 2.4
0.99 + 0.1 = 1.09
10 - 9.2 = 0.8
7.8 + 1.6 = 9.4
3.8 + 0.12 = 3.92
1.4 - 0.9 = 0.5
2.5 - 0.5 = 2
3.8 - 1.4 = 2.4
0.99 + 0.1 = 1.09
10 - 9.2 = 0.8
2. 用竖式计算,带*号的要验算。
7.83 + 1.67 = 6.12 - 3.85 = *8.7 + 10.35 =
8 - 2.45 = 0.96 + 1.12 = *12.65 - 2.35 =
7.83 + 1.67 = 6.12 - 3.85 = *8.7 + 10.35 =
8 - 2.45 = 0.96 + 1.12 = *12.65 - 2.35 =
答案
2. 9.5 2.27 19.05 5.55 2.08 10.3
3. 递等式计算。
2.08 + 3.17 + 4.5 7.24 + 6.26 - 4.75 14.75 - 2.37 - 2.63
2.08 + 3.17 + 4.5 7.24 + 6.26 - 4.75 14.75 - 2.37 - 2.63
答案
3. 9.75 8.75 9.75
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