题目
计算,能简算的要简算。
①60-(3.7+0.75+8.6)
②4.64+5.78+1.36+5.22
③28.29-(6.9+18.29)
④37.15-8.3- (在 里添上一个数,可以使计算简便)
⑤8.3+5.85-4.13
⑥55.5-33.18-10.82
答案:①60-(3.7+0.75+8.6) =60-(4.45+8.6) =60-13.05 =46.95 ②4.64+5.78+1.36+5.22 =(4.64+1.36)+(5.78+5.22) =6+11 17 ③28.29-(6.9+18.29) =28.29-6.9-18.29 =28.29-18.29-6.9 =10-6.9 =3.1 ④37.15-8.3-7.15 =37.15-7.15-8.3 =30-8.3 =21.7 ⑤8.3+5.85-4.13 =14.15-4.13 =10.02 ⑥55.5-33.18-10.82 =55.5-(33.08+10.82) =55.5-44 =11.5