问题
解答题
用递等式计算
12×(53+147×4)
985-400÷80×4
(84+14)×(210÷3)
[175-(49+26)]×15.
答案
(1)12×(53+147×4)
=12×(53+588)
=12×641
=7692;
(2)985-400÷80×4
=985-5×4
=985-20
=965;
(3)(84+14)×(210÷3)
=98×70
=6860;
(4)[175-(49+26)]×15
=[175-75]×15
=100×15
=1500.