发布网友 发布时间:2024-09-30 05:19
共1个回答
热心网友 时间:2024-11-26 01:23
①13.8-2.99, =13.8-3+0.01, =10.8+0.01, =10.81; ②3.1+25.78+6.9, =(3.1+6.9)+25.78, =10+25.78, =35.78; ③12.7-4.8-5.2, =12.7-(4.8+5.2), =12.7-10, =2.7; ④34.82-(4.82+15.2), =34.82-4.82-15.2, =30-15.2, =14.8; ⑤15.25+4.72+4.75+5.28, =(15.25+4.75)+(4.72+5.28), =20+10, =30; ⑥3.28-(2.2-1.28), =3.28-2.2+1.28, =1.08+1.28, =2.36. |