能用简便方法的要用简便方法.
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/09/30 04:20:14
①58-16÷
4 5 , =58-20, =38; ② 2 9 - 6 15 × 2 9 , =(1- 6 15 )× 2 9 , = 9 15 × 2 9 , = 2 15 ; ③62.5÷2.5÷4, =62.5÷(2.5×4), =62.5÷10, =6.25; ④8160÷24-36×2.5, =340-90, =250; ⑤ 36×( 5 6 + 1 12 - 1 3 ) , =36× 5 6 +36× 1 12 -36× 1 3 , =30+3-12, =21; ⑥ 3.5÷[1-(0.4+ 1 4 )] , =3.5÷[1-0.65], =3.5÷0.35, =10. |