解方程 1.5x+9.6=36.6 x-2/5x=4/7 25x÷2=475 3/4x-1/2x=114 2.4x-48=5.4 2/7x+3/8=4/7
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(1)
5x+9.6=36.6
5x=36.6-9.6
5x=27
x=27/5
(2)
x-2/5x=4/7
(1-2/5)x=4/7
(3/5)x=4/7
x=(4/7)/(3/5)
x=20/21
(3)
25x÷2=475
25x=2*475
25x=950
x=38
(4)
3/4x-1/2x=114
(3/4-1/2)x=114
(1/4)x=114
x=114*4
x=456
(5)
2.4x-48=5.4
2.4x=5.4+48
2.4x=53.4
x=22.25
(6)
2/7x+3/8=4/7
2/7x=4/7-3/8
2/7x=11/56
x=(11/56)/(2/7)
x=11/16
5x+9.6=36.6
5x=36.6-9.6
5x=27
x=27/5
(2)
x-2/5x=4/7
(1-2/5)x=4/7
(3/5)x=4/7
x=(4/7)/(3/5)
x=20/21
(3)
25x÷2=475
25x=2*475
25x=950
x=38
(4)
3/4x-1/2x=114
(3/4-1/2)x=114
(1/4)x=114
x=114*4
x=456
(5)
2.4x-48=5.4
2.4x=5.4+48
2.4x=53.4
x=22.25
(6)
2/7x+3/8=4/7
2/7x=4/7-3/8
2/7x=11/56
x=(11/56)/(2/7)
x=11/16
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