问题 解答题

神机妙算.

42÷7×24 (125+185)×647+25×3

1800-28×735×4+680 420×2+140.

答案

(1)42÷7×24

=6×24

=144;

(2)(125+185)×6

=310×6

=1860;

(3)47+25×3

=47+75

=122;

(4)1800-28×7

=1800-196

=1604;

(5)35×4+680

=140+680

=820;

(6)420×2+140

=840+140

=980.

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