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.

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