分数简便运算1、(3/8+1/27)x8+19/272、7-5÷7-1/7x93、(8/9÷6+1/8x7/6)÷(2-4/3)4、(65/7+65/9)÷(5/7+5/9)5、5/4x64+25/2x7/2+1÷4/56、5/4x64+25/2x7/2+1÷4/5

Question

分数简便运算
1、(3/8+1/27)x8+19/27
2、7-5÷7-1/7x9
3、(8/9÷6+1/8x7/6)÷(2-4/3)
4、(65/7+65/9)÷(5/7+5/9)
5、5/4x64+25/2x7/2+1÷4/5
6、5/4x64+25/2x7/2+1÷4/5

Answer 1

1、(3/8+1/27)x8+19/27
=3/8x8+（1/27x8+19/27）
=3+1/27x（8+19）
=3+1
=4
2、7-5÷7-1/7x9
=7-1/7(5+9)
=7-2
=5
3、(8/9÷6+1/8x7/6)÷(2-4/3)
=(8/9÷6+1/8x7/6)×3/2
=(8/9×1/6+1/8x7/6)×3/2
=1/6(8/9+7/8)×3/2
=(8/9+7/8)×1/4
=127/288
4、(65/7+65/9)÷(5/7+5/9)
=65（1/7+1/9)÷5÷(1/7+1/9)
=65÷5×【（1/7+1/9) ÷(1/7+1/9)】
=13
5、5/4x64+25/2x7/2+1÷4/5
=5/4x64+5×5×7/4+1×5/4
=5/4x（64+35+1）
=5/4x100
=125