Câu trả lời:
y+30%y=−1,3y(1−30%)=−1,3y⋅0,7=−1,3y=−1,3:0,7y=−137y+30%y=−1,3y(1−30%)=−1,3y⋅0,7=−1,3y=−1,3:0,7y=−137
Vậy y=−137y=−137
y−0,25%y=12y(1−0,25%)=0,5y⋅0,9975=0,5y=0,5:0,9975y=200399y−0,25%y=12y(1−0,25%)=0,5y⋅0,9975=0,5y=0,5:0,9975y=200399
Vậy y=200399y=200399
0,5x+23x=712x(12+23)=712x⋅76=712x=712:76x=120,5x+23x=712x(12+23)=712x⋅76=712x=712:76x=12
Vậy x=12x=12
3x7+1−4=−18⇒8⋅3x7+1=4⇒3x8=12⇒2⋅3x=8⇒6x=8⇒x=433x7+1−4=−18⇒8⋅3x7+1=4⇒3x8=12⇒2⋅3x=8⇒6x=8⇒x=43
Vậy x=43