Đáp án:
Giải thích các bước giải:
d)
10x+3−5x=4x+1210x+3−5x=4x+12
⇔10x−5x−4x=12−3⇔10x−5x−4x=12−3
⇔x=9⇔x=9
Vậy...
e)
11x+42−2x=100−9x−2211x+42−2x=100−9x−22
⇔11x−2x+9x=100−22−42⇔11x−2x+9x=100−22−42
⇔18x=36⇔18x=36
⇔x=2⇔x=2
Vậy...
f)
2x−(3−5x)=4(x+3)2x−(3−5x)=4(x+3)
⇔2x−3+5x=4x+12⇔2x−3+5x=4x+12
⇔2x+5x−4x=12+3⇔2x+5x−4x=12+3
⇔3x=15⇔3x=15
⇔x=5⇔x=5
Vậy...
g)
x(x+2)=x(x+3)x(x+2)=x(x+3)
⇔x2+2x=x2+3x⇔x2+2x=x2+3x
⇔x2−x2=3x−2x⇔x2−x2=3x−2x
⇔0=1x⇔0=1x
⇔x=0⇔x=0
Vậy...
h)
2(x−3)+3x(x−1)=5x22(x−3)+3x(x−1)=5x2
⇔2x−6+5x2−5=5x2⇔2x−6+5x2−5=5x2
⇔2x+5x2−5x2=6+5⇔2x+5x2−5x2=6+5
⇔2x=11⇔2x=11
⇔x=5,5⇔x=5,5
Vậy....
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