решите уравнение 4*(1 3/4х + 1 1/2) = 10,9

4*(7/4х+3/2)=10, 9
7/4х+3/2=109/10:4/1
7/4х+3/2=109/10*1/4
7/4х+3/2=109/40
7/4х=109/40-3/2
7/4х=109/40-60/40
7/4х=49/40
х=49/40:7/4
х=49/40*4/7
х=196/280
х=7/10

<span>1 3/4х + 1 1/2=10,9:4=109/40=2 29/40</span>
1 3/4х =<span>2 29/40 - 1 1/2=</span><span>2 29/40 - 1 20/40=1 9/40
х=</span><span>1 9/40</span> :1 3/4=49/40:7/4=19/40*4/7=119/10=11,9