问题 解答题
估算.
703×21≈
299×32≈473×99≈
298×7≈699×9≈372×19≈
答案

(1)703×21,

≈700×20,

=14000;

(2)299×32,

≈300×30,

=9000;

(3)473×99,

≈470×100,

=4700;

(4)298×7,

≈300×7,

=2100;

(5)699×9,

≈700×9,

=6300;

(6)372×19,

≈380×20,

=7600.

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