第1个回答 2012-11-27
(3/8+1/27)x8+19/27
=3/8x8+1/27x8+19/27
=3+(8/27+19/27)
=3+1
=4
7-5÷7-1/7x9
=7-5x1/7-9x1/7
=7-5/7-9/7
=7-(5/7+9/7)
=7-14/7
=7-2
=5
(8/9÷6+1/8x7/6)÷(2-4/3)
=(8/54+7/48)÷2/3
=(4/27+7/48)x3/2
=127/432x3/2
=127/288
(65/7+65/9)÷(5/7+5/9)
=(13x5/7+13x5/9)÷(5/7+5/9)
=13x(5/7+5/9)÷(5/7+5/9)
=13
5/4x64+25/2x7/2+1÷4/5
=5/4x64+(5x5x7)/(2x2)+1x5/4
=5/4x64+5/4x35+5/4x1
=5/4x(64+35+1)
=5/4x100
=125
5/4x64+25/2x7/2+1÷4/5
=5/4x64+(5x5x7)/(2x2)+1x5/4
=5/4x64+5/4x35+5/4x1
=5/4x(64+35+1)
=5/4x100
=125(与上题一样)
很高兴为你解答，不懂请追问！满意请采纳，谢谢！
第2个回答 2012-11-27
1、(3/8+1/27)x8+19/27 =3/8x8+1/27x8+19/27 =3+8/27+19/27 =3+(8/27+19/27) =3+1 =4 2、7-5÷7-1/7x9 =7-5x1/7-9/7 =7-5/7-9/7 =7-(5/7+9/7) =7-14/7 =7-2 =5 3、(8/9÷6+1/8x7/6)÷(2-4/3) =(8/9x1/6+1/8x7/6)÷(6/3-4/3 =(8/54+7/48)÷2/3 =135/432x3/2 =15/32 4、(65/7+65/9)÷(5/7+5/9) =(585/63+455/63)÷(45/63+35/63) =1040/63x63/80 =13 5、5/4x64+25/2x7/2+1÷4/5 =80+175/4+1x5/4 =80+(175/4+5/4) =80+45 =125 第5题跟第6题一样
第3个回答 2012-11-27
1、原式=3+8/27+19/27
=3+(8+19)/27
=3+1
=4
2、 原式=7-（5+9）/7
=7-2
=5
3、原式=(4/27+7/48) ÷(2/3)
=4/27÷(2/3)+7/48÷(2/3)
=(4*3)/(27*2)+(7*3)/(48*2)
=2/9+7/32
=(64+63)/288
=127/288
4、原式= (65/7+65/9)÷(80/63)
=65/7x63/80+65/9x63/80
=65x9/80+65x7/80
=(9+7)x65/80
=16x65/80
=13
5、原式=80+（165+5）/4
=80+180/4
=125
6、同上
第4个回答 2012-11-27
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本回答被网友采纳