Question

20道简便运算带答案六年级上册带过程

20道简便运算带答案六年级上册带过程

Answer 1

1.4/7 × 5/9 + 3/7 × 5/9 =(4/7+3/7)x5/9=1x5/9=5/9

2. 5/2 -（ 3/2 + 4/5 ）=5/2-3/2-4/5=1-4/5=1/5
3. 6 ×（ 1/2 + 2/3 ）=6x1/2+6x2/3=3+4=7
4. 8 × 4/5 + 8 × 11/5=8x(4/5+11/5)=8x3=24

5. 31 × 5/6 – 5/6 =(31-1)x5/6=30x5/6=25

6. 4/5 × 25/16 + 2/3 × 3/4 =5/4+1/2=5/4+2/4=7/4
7. 101 × 1/5 – 1/5 × 21 =(101-21)x1/5=80x1/5=16

Answer 2

最佳答案的第一道题不能用简便算法！！得数也不对

Answer 3

引用瀛洲烟雨的回答：
1.4/7 × 5/9 + 3/7 × 5/9 =(4/7+3/7)x5/9=1x5/9=5/9

2. 5/2 -（ 3/2 + 4/5 ）=5/2-3/2-4/5=1-4/5=1/5
3. 6 ×（ 1/2 + 2/3 ）=6x1/2+6x2/3=3+4=7
4. 8 × 4/5 + 8 × 11/5=8x(4/5+11/5)=8x3=24

5. 31 × 5/6 – 5/6 =(31-1)x5/6=30x5/6=25

6. 4/5 × 25/16 + 2/3 × 3/4 =5/4+1/2=5/4+2/4=7/4
7. 101 × 1/5 – 1/5 × 21 =(101-21)x1/5=80x1/5=16

第一个上面是6下面成了1/6