问题 解答题
估算.
32×48≈
43×22≈41×19≈32×51≈
答案

(1)32×48,

≈30×50,

=1500;

(2)43×22,

≈40×20,

=800;

(3)41×19,

≈40×20,

=800;

(4)32×51,

≈30×50,

=1500.

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