问题
解答题
估算.
|
答案
151×29,
≈150×30,
=4500;
813×89,
≈810×90,
=72900;
70×301,
≈70×300,
=21000;
69×402,
≈70×400,
=28000.
估算.
|
151×29,
≈150×30,
=4500;
813×89,
≈810×90,
=72900;
70×301,
≈70×300,
=21000;
69×402,
≈70×400,
=28000.