Tìm số tự nhiên xa) 70 – 5. ( x- 3) = 45 b) 10 + 2.x = 45: 4 3c) 2.x - 138 = 23. 32 d) 231 – (x- 6) = 1339: 13 e) (x+2)2 = 16 f) (x-4)3 - 64 = 0 g) 96 + ( x- 1) = 36 h) (2.x +1) – 131 = 10 i) 4.( x- 2) = 16 i) (x- 5). (x –...
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Tìm số tự nhiên x
a) 70 – 5. ( x- 3) = 45 b) 10 + 2.x = 45: 4 3
c) 2.x - 138 = 23. 32 d) 231 – (x- 6) = 1339: 13
e) (x+2)2 = 16 f) (x-4)3 - 64 = 0
g) 96 + ( x- 1) = 36 h) (2.x +1) – 131 = 10
i) 4.( x- 2) = 16 i) (x- 5). (x – 12)
a.70−5.(x−3)=45a.70-5.(x-3)=45
5.(x−3)=70−455.(x-3)=70-45
5.(x−3)=255.(x-3)=25
x−3=25:5x-3=25:5
x−3=5x-3=5
x=5+3x=5+3
x=8x=8
b.10+2.x=45:43b.10+2.x=45:43
10+2.x=1610+2.x=16
2x=16−102x=16-10
2x=62x=6
x=6:2x=6:2
x=3x=3
c.2.x−138=23c.2.x-138=23.32.32
2.x−138=8.92.x-138=8.9
2.x−138=722.x-138=72
2.x=72+1382.x=72+138
2.x=2102.x=210
x=210:2x=210:2
x=105x=105
d.231−(x−6)=1339:13d.231-(x-6)=1339:13
231−x+6=103231-x+6=103
231−x=103−6231-x=103-6
231−x=97231-x=97
x=231−97x=231-97
x=134
a.70−5.(x−3)=45a.70-5.(x-3)=45
5.(x−3)=70−455.(x-3)=70-45
5.(x−3)=255.(x-3)=25
x−3=25:5x-3=25:5
x−3=5x-3=5
x=5+3x=5+3
x=8x=8
b.10+2.x=45:43b.10+2.x=45:43
10+2.x=1610+2.x=16
2x=16−102x=16-10
2x=62x=6
x=6:2x=6:2
x=3x=3
c.2.x−138=23c.2.x-138=23.32.32
2.x−138=8.92.x-138=8.9
2.x−138=722.x-138=72
2.x=72+1382.x=72+138
2.x=2102.x=210
x=210:2x=210:2
x=105x=105
d.231−(x−6)=1339:13d.231-(x-6)=1339:13
231−x+6=103231-x+6=103
231−x=103−6231-x=103-6
231−x=97231-x=97
x=231−97x=231-97
x=134