Toán Lớp 6: a,2x-1/3=25/21
b,3x+2/15=12/9
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Toán Lớp 6: a,2x-1/3=25/21
b,3x+2/15=12/9
Comments ( 2 )
Giải đáp:
Lời giải và giải thích chi tiết:
a,2x-1/3=25/21
2x=25/21+1/3
2x=25/21+7/21
2x=32/21
x=32/21:2
x=16/21
Vậy x=16/21
b,3x+2/15=12/9
3x=12/9-2/15
3x=4/3-2/15
3x=20/15-2/15
3x=18/15
3x=6/5
x=6/5:3
x=2/5
Vậy x=2/5
a, 2x – 1/3 = 25/21
=> 2x = 25/21 + 1/3
=> 2x = 25/21 + 7/21
=> 2x = 32/21
=> x = 32/21 : 2
=> x = 16/21
Vậy x = 16/21
b, 3x + 2/15 = 12/9
=> 3x = 12/9 – 2/15
=> 3x = 60/45 – 6/45
=> 3x = 6/5
=> x = 6/5 : 3
=> x = 2/5
Vậy x = 2/5