问题
填空题
先估一估括号内可填几,再用计算器检验,得出正确的答案.
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答案
29×42≈30×40=1200,
29×42=1218,
167×42≈160×40=6400,
167×42=6847,
405×22≈400×20=8000;
405×22=8910;
故答案为:42,40,1218;41,40,6847,22,20,8910.
先估一估括号内可填几,再用计算器检验,得出正确的答案.
|
29×42≈30×40=1200,
29×42=1218,
167×42≈160×40=6400,
167×42=6847,
405×22≈400×20=8000;
405×22=8910;
故答案为:42,40,1218;41,40,6847,22,20,8910.