(1) 8 9x = 7 12 , 63x=8×12, 63x
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(1) 8 9x = 7 12 , 63x=8×12, 63x÷63=8×12÷63, x= 32 21 ;
(2)2.4: 3 2 =3.2:x, 2.4x=3.2× 3 2 , 2.4x÷2.4=3.2× 3 2 ÷2.4, x=2;
(3) 28 3 x= 49 9 × 9 7 , 28 3 x÷ 28 3 = 49 9 × 9 7 ÷ 28 3 , x= 3 4 ;
(4) 3 2 ×3+2.75x= 19 3 , 9 2 +2.75x= 19 3 , 9 2 +2.75x- 9 2 = 19 3 - 9 2 , 2.75x= 11 6 , 2.75x÷2.75= 11 6 ÷2.75, x= 2 3 ;
(5) 5.6x- 3 5 x=4.8 , 5x=4.8, 5x÷5=4.8÷5, x=0.96;
(6)5x-3× 7 10 = 7 5 , 5x- 21 10 = 7 5 , 5x- 21 10 + 21 10 = 7 5 + 21 10 , 5x= 35 10 , 5x÷5= 35 10 ÷5, x= 7 10 .
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