问题 解答题
计算:
(1)(
1
3
-
5
7
-
2
5
)×105;
(2)(-1
1
2
)×(-1
1
3
)×(-1
1
4
)×(-1
1
5
);
(3)12.25×(-13.5)×(-40)×20;
(4)17.48×37+174.8×1.9+8.74×88.
答案

(1)原式=35-75-42

=-82;

(2)原式=

3
2
×
4
3
×
5
4
×
6
5

=3;

(3)原式=(12.25×40)×(13.5×20)

=490×270

=132300;

(4)原式=17.48×37+17.48×1.9+17.48×44

=17.48×(37+19+44)

=17.48×100

=1748.

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