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估算.143.57÷123.77×9914.78+19.9+7.35+1.25+0.89198.8×90%
题目详情
估算.
143.57÷12
3.77×991
4.78+19.9+7.35+1.25+0.89
198.8×90%
143.57÷12
3.77×991
4.78+19.9+7.35+1.25+0.89
198.8×90%
▼优质解答
答案和解析
1①43.57÷12≈12;
②3.77×991≈3770;
③4.78+19.9+7.35+1.25+0.89
=(4.78+1.25)+19.9+(7.35+0.89
≈6+20+8
=34;
④198.8×90%≈180.
②3.77×991≈3770;
③4.78+19.9+7.35+1.25+0.89
=(4.78+1.25)+19.9+(7.35+0.89
≈6+20+8
=34;
④198.8×90%≈180.
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