题目内容

递等式计算.
743-450÷18×2588×125
2
3
×(1÷
3
4
-1)
519.2÷(24.3×2-4.6)126×98+126+63×2.
(1)743-450÷18×25,
=743-25×25,
=743-625,
=118;

(2)88×125,
=11×8×125,
=11×(8×125),
=11×1000,
=11000;

(3)
2
3
×(1÷
3
4
-1),
=
2
3
×(
4
3
-1),
=
2
3
×
1
3

=
2
9


(4)519.2÷(24.3×2-4.6),
=519.2÷(48.6-4.6),
=519.2÷44,
=11.8;

(5)126×98+126+63×2,
=126×98+126×1+126×1,
=126×(98+1+1),
=126×100,
=126.
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