Đáp án:
Giải thích các bước giải:
\(5/\\ a,\ (5x-15)\times 35=0\\ ⇔5x-15=0\\ ⇔5x=15\\ ⇔x=3\\ \text{Vậy x = 3}\\ b,\ 32\times (3x-11)=32\\ ⇔3x-11=1\\ ⇔3x=12\\ ⇔x=4\\ \text{Vậy x = 4}\\ c,\ (5x-12)\times 25=200\\ ⇔5x-12=8\\ ⇔5x=20\\ ⇔x=4\\ \text{Vậy x = 4}\\ d,\ (134-2x)\times 2017=0\\ ⇔134-2x=0\\ ⇔2x=134\\ ⇔x=67\\ \text{Vậy x = 67}\\ e,\ (6x-29)-11=0\\ ⇔6x-29=11\\ ⇔6x=40\\ ⇔x=\dfrac{40}{6}=\dfrac{20}3\\ \text{Vậy x = $\dfrac{20}3$}\\ i,\ (3x-59)-16=0\\ ⇔3x-59=16\\ ⇔3x=75\\ ⇔x=25\\ \text{Vậy x = 25}\\ f,\ 12\times (2+38)=504\\ ⇔2x+38=42\\ ⇔2x=4\\ ⇔x=2\\ \text{Vậy x = 2}\\ k,\ 4\times (2x+8)=56\\ ⇔2x+8=14\\ ⇔2x=6\\ ⇔x=3\\ \text{Vậy x = 3}\\ g,\ 88-3\times (7+2x)=64\\ ⇔3\times (7+2x)=24\\ ⇔7+2x=8\\ ⇔2x=1\\ ⇔x=\dfrac12\\ \text{Vậy x = $\dfrac12$}\\ l,\ 58-3\times (7+2x)=28\\ ⇔3\times (7+2x)=30\\ ⇔7+2x=10\\ ⇔2x=3\\ ⇔x=\dfrac{3}{2}\\ \text{Vậy x = $\dfrac32$}\\ h,\ \left [(3x+32)-17\right ]\times 2=42\\ ⇔(3x+32)-17=21\\ ⇔3x+32=38\\ ⇔3x=6\\ ⇔x=2\\ \text{Vậy x = 2}\\ m,\ \left [(5x+12)-37\right ]:2=25\\ ⇔(5x+12)-37=50\\ ⇔5x+12=87\\ ⇔5x=75\\ x=15\\ \text{Vậy x = 15}\)
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