Question

Giải các phương trình sau:

a) 3(2,2-0, 3x) =2,6+(0,1x-4).

b) 48x=32(x+1)

c) 9(2x+2) =144

d) 2(1-1,5x) +3x=0

Gíup mình với

Answer 1

\(a.3\left(2.2-0.3x\right)=2.6+\left(0.1x-4\right)\\ \Leftrightarrow6.6-0.9x=2.6+0.1x-4\\ \Leftrightarrow6.6-0.9x-2.6-0.1x+4=0\\ \Leftrightarrow-x+8=0\\ \Leftrightarrow-x=-8\\ \Leftrightarrow x=8\)

\(b.48x=32\left(x+1\right)\\ \Leftrightarrow48x-32\left(x+1\right)=0\\ \Leftrightarrow48x-32x-32=0\\ \Leftrightarrow16x-32=0\\ \Leftrightarrow16x=32\\ \Leftrightarrow x=2\)

\(c.9\left(2x+2\right)=144\\ \Leftrightarrow18x+18=144\\ \Leftrightarrow18x+18-144=0\\ \Leftrightarrow18x-126=0\\ \Leftrightarrow18x=126\\ \Leftrightarrow x=7\)

\(d.2\left(1-1.5x\right)+3x=0\\ \Leftrightarrow2-3x+3x=0\\ \Leftrightarrow2+0x=0\)

⇔0x = -2 ( phương trình vô nghiệm)