3个回答
2018-06-21
展开全部
计算
(1)12/11*(2/3+1/4)+2/3
=12/11*(8/12+3/12)+2/3
=12/11*11/12+2/3
=1+2/3
=1又2/3
(2)(2又3/5+2又3/7)-(2又3/5-1又4/7)
=2又3/5+2又3/7-2又3/5+1又4/7
=2又3/7+1又4/7
=4
(3)7/8*1.7+3又1/8*1.7+1.7*2
=1.7*(7/8+3又1/8+2)
=1.7*6
=10.2(或者10又1/5)
解方程
(1)3x/4=5.5
解:3x=5.5*4=22
x=22/3=7又1/3
(2)7.4x-4/5x=7
解:(7.4-4/5)x=7
(7又2/5-4/5)x=7
33/5 x=7
x=35/33
(3)8x-3*4=4
解:8x-12=4
8x=12+4=16
x=16/8=2
(1)12/11*(2/3+1/4)+2/3
=12/11*(8/12+3/12)+2/3
=12/11*11/12+2/3
=1+2/3
=1又2/3
(2)(2又3/5+2又3/7)-(2又3/5-1又4/7)
=2又3/5+2又3/7-2又3/5+1又4/7
=2又3/7+1又4/7
=4
(3)7/8*1.7+3又1/8*1.7+1.7*2
=1.7*(7/8+3又1/8+2)
=1.7*6
=10.2(或者10又1/5)
解方程
(1)3x/4=5.5
解:3x=5.5*4=22
x=22/3=7又1/3
(2)7.4x-4/5x=7
解:(7.4-4/5)x=7
(7又2/5-4/5)x=7
33/5 x=7
x=35/33
(3)8x-3*4=4
解:8x-12=4
8x=12+4=16
x=16/8=2
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