问题 解答题
化简下列各题:
(1)
252-242

(2)
(-4)×
25
9
×(-169)

(3)(-
7
4
24
)×(-
2
7
6
)

(4)6
3x2y3
-3
12x4
y

(5)
10x
-
10-1xy

(6)
3
4
×(-
2
2
3
56
答案

(1)原式=

(25+24)×(25-24)

=

49

=7;

(2)原式=

25
9
×169

=

4
×
25
9
×
169

=2×

5
3
×13

=

130
3

(3)原式=

1
2
24×6

=6;

(4)原式=18

36x6y2

=108x3y;

(5)原式=

x2y

=x

y

(6)原式=-

3
4
×
8
3
×56

=-4

7

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