一、解方程。
0.3x + 1.1 = 3.8 4x + 54.2 = 80.6 4.2x + 6.2×3 = 31.2
5x + 3x = 12.8 8x - 1.6x = 3.2 x - 48 + 22 = 26.8
10.5 + 3x = 16.2 2.5x - 0.5÷0.2 = 7.5 7(x - 36) = 35.7
3x - 24 = 0.96 4.5 + 2x = 11.5 5.1x - 3.5x = 0.8
8x + 2.3 = 18.3 0.52x - 0.12x = 16.8 6x÷3 = 1.98

$x = 9$
$x = 6.6$
$x = 3$
$x = 1.6$
$x = 0.5$
$x = 52.8$
$x = 1.9$
$x = 4$
$x = 41.1$
$x = 8.32$
$x = 3.5$
$x = 0.5$
$x = 2$
$x = 42$
$x = 0.99$

二、计算下面各题，怎样简便就怎样计算。
8.88×0.125 6.48×0.4 + 9.52÷2.5 27.63 - 3.54 - 17.63 - 2.46
175×2.5 + 2.5×25 12.6 - 8.84÷1.7÷13 (25.2 - 1.4)÷17 + 0.76
762 - (0.44×13 + 750) 3.62 + (5.6×10.1 - 0.98) 16.31 - (7.63 - 4.69) - 2.37
40.5 - 24.5÷3.5 + 0.62 9.42×4.5 + 94.2×0.55 9.99×1.01
55×[27.3 - (7.17 + 2.63)] 1.44÷[9.6÷(245 - 165)] 1800÷[750×(970 - 968)]

1.11 6.4 4
500 12.2 2.16
6.28 59.2 11
34.12 94.2 10.0899
962.5 12 1.2