问题 解答题
用你喜欢的方法计算
1200-397
247+3.08+253
100÷8÷1.2515
6
7
×7
5
1
3
-6
3
4
+9
3
4
-3
1
3
2.25×4.8+0.48×77.5.
答案

(1)1200-397

=1200-400+3

=800+3

=803;

(2)247+3.08+253

=247+253+3.08

=500+3.08

=503.08;

(3)100÷8÷1.25

=100÷(8×1.25)

=100÷10

=10;

(4)15

6
7
×7

=15×7+

6
7
×7

=105+6

=111;

(5)5

1
3
-6
3
4
+9
3
4
-3
1
3

=(5

1
3
+9
3
4
)-(6
3
4
+3
1
3

=15-10

=5;

(6)2.25×4.8+0.48×77.5

=4.8×(2.25+7.75)

=4.8×10

=48.

判断题
单项选择题