1) (1-7/10)х=2ц1/4,Так как 1=10/10 и 10/10 - 7/10 = 3/10(3/10)х=2ц1/4,х=2ц1/4 : (3/10)х=(9/4)·10/3х=15/2х=7,5 2) (1/4+1/5)х=1ц4/5, ((5/20)+(4/20))х=9/5 (9/20)х=9/5 х=(9/5):(9/20) х=(9/5)·(20/9) х=43) (3ц1/8+1ц3/4)х=2ц1/6 (3ц1/8+1ц6/8)х=2ц1/6 (4ц7/8)х=2ц1/6 х=2ц1/6 : (4ц7/8) х=(13/6):(39/8) х=(13/6)·(8/39) х=4/94) (2ц1/12-1ц5/6)х=3/4 (2ц1/12-1ц10/12)х=3/4 (1ц13/12-1ц10/12)х=3/4 (3/12)х=3/4х=(3/4): (3/12) х=(3/4)·(12/3)х=3