Respuesta:
1) 38+7x-21= 9x-9
38-21+9= 9x -7x
26= 2x
26÷2= x
13= x
1) 38+7(13-3)= 9(13-1)
38+7.13-21= 9.13-9
38+ 91-21= 117-9
108= 108
2) 21x+14-20x+15= 4x-8+1
14+15+8-1= 20x+4x-21x
36= 3x
36÷3= x
12= x
2) 7(3.12+2)-5(4.12-3)= 4(12-2)+1
7( 36+2)-5(48-3)= 4.10+1
7. 38-5. 45= 40+1
266- 225= 41
41= 41
3) 20+5x= 7x-2
20+2= 7x-5x
22= 2x
22÷2= x
11= x
3) 5(4+11)= 7.11-2
5.15= 77-2
75= 75
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Respuesta:
1) 38+7x-21= 9x-9
38-21+9= 9x -7x
26= 2x
26÷2= x
13= x
1) 38+7(13-3)= 9(13-1)
38+7.13-21= 9.13-9
38+ 91-21= 117-9
108= 108
2) 21x+14-20x+15= 4x-8+1
14+15+8-1= 20x+4x-21x
36= 3x
36÷3= x
12= x
2) 7(3.12+2)-5(4.12-3)= 4(12-2)+1
7( 36+2)-5(48-3)= 4.10+1
7. 38-5. 45= 40+1
266- 225= 41
41= 41
3) 20+5x= 7x-2
20+2= 7x-5x
22= 2x
22÷2= x
11= x
3) 5(4+11)= 7.11-2
5.15= 77-2
75= 75