早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算,能简算的要简算.①6.21-3.8+2.2②6.03+3.7+2.97③17.43-6.57-2.43④20.47-(1.47+6.8)⑤13.26+4.71+3.47+5.29⑥22.74+8.68-13.74.

题目详情
计算,能简算的要简算.
①6.21-3.8+2.2

②6.03+3.7+2.97
③17.43-6.57-2.43 ④20.47-(1.47+6.8)
⑤13.26+4.71+3.47+5.29 ⑥22.74+8.68-13.74.
▼优质解答
答案和解析
①6.21-3.8+2.2,
=2.41+2.2,
=4.61;

②6.03+3.7+2.97,
=(6.03+2.97)+3.7,
=9+3.7,
=12.7;

③17.43-6.57-2.43,
=17.43-(6.57+2.43),
=17.43-9,
=8.43;

④20.47-(1.47+6.8),
=20.47-1.47-6.8,
=19-6.8,
=12.2;

⑤13.26+4.71+3.47+5.29,
=(13.26+3.47)+(4.71+5.29),
=16.73+10,
=26.73;

⑥22.74+8.68-13.74,
=(22.74-13.74)+8.68,
=9+8.68,
=17.68.