(2006?晋江市模拟)口算. 800-250=30×40=8100÷900=10-0.98=105÷7=560+770=0.25×0.4=6.3÷0.07=0.64÷8=8.85×10=4.73+0

2024-10-20 05:26:45
(2006?晋江市模拟)口算.
800-250= 30×40= 8100÷900= 10-0.98= 105÷7= 560+770=
0.25×0.4= 6.3÷0.07= 0.64÷8= 8.85×10= 4.73+0.7=
3
9
+
7
9
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5
8
×
4
10
=
5
6
÷3
=
5
8
-
1
2
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3.6×
1
4
=
8×1.36×1.25= 7.2×2.8+2.8×0.8=
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最佳答案

分析:8×1.36×1.25运用乘法交换律简算;7.2×2.8+2.8×0.8运用乘法分配律简算;其它题目根据运算法则直接求解.解答:解:

800-250=550,

30×40=1200,

8100÷900=9,

10-0.98=9.02,

105÷7=15,

560+770=1330,

0.25×0.4=0.1,

6.3÷0.07=90,

0.64÷8=0.08,

8.85×10=88.5,

4.73+0.7=5.43,

3

9

+

7

9

=

10

9

5

8

×

4

10

=

1

4

5

6

÷3=

5

18

5

8

-

1

2

=

1

8

3.6×

1

4

=0.9,

8×1.36×1.25=13.6,

7.2×2.8+2.8×0.8=22.4.

点评:口算题目要求快速准确,能运用简算方法的要简算.

2024-10-20 05:26:45
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