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1. 当x = 20时，4x + 5〇82，4x - 5〇82。
答案
1. $＞$ $＜$
2. 当x = 0.8时，3x + 5x〇6.4，3x + 5〇6.4。
答案
2. $=$ $＞$
3. 当x = 0.24时，5x - 2x〇1，5x + 2x〇1。
答案
3. $＜$ $＞$
4. 当x = 8时，(x + 12)×6〇120，x + 12×6〇120。
答案
4. $=$ $＜$
5. 当x = 2.4时，(2 + x)÷5〇0.8，2 + x÷5〇0.8。
答案
5. $＞$ $＞$
6. 当x = 6时，(3x + 2)÷4〇5，(3x - 2)÷4〇5。
答案
6. $=$ $＜$
二、解方程。
x - 4.2 = 0.6
x×0.6 = 0.54
5x÷3 = 3.5
3.4×2x = 51
4.6 + 3x = 13
3.8x - 1.5x = 0.69
15 + 5x = 25
4x - 2.7 = 7.3
2.9x÷5 = 0.58
5(x - 0.4) = 20
3.8÷2 + 2x = 4.8
(2.7 + 3.7)x = 70.4
5x + 2x = 1.47
6x = 1.44
7x + 4.2x = 11.2
9.1x - 5.6x = 63
7.5x + x = 10.2
5x - 36 = 74
1.2x + 3.5 = 19.1
9.5x - x = 31.45
6x + 0.4x = 9.6
6x + 0.4x = 16
6x + 18x = 120
3.2x - 1.6x = 8
3.4x - 48 = 26.8
0.32x - 0.5×4 = 0.56
0.48 + x + 7.4 = 9.7
x - 4.2 = 0.6
x×0.6 = 0.54
5x÷3 = 3.5
3.4×2x = 51
4.6 + 3x = 13
3.8x - 1.5x = 0.69
15 + 5x = 25
4x - 2.7 = 7.3
2.9x÷5 = 0.58
5(x - 0.4) = 20
3.8÷2 + 2x = 4.8
(2.7 + 3.7)x = 70.4
5x + 2x = 1.47
6x = 1.44
7x + 4.2x = 11.2
9.1x - 5.6x = 63
7.5x + x = 10.2
5x - 36 = 74
1.2x + 3.5 = 19.1
9.5x - x = 31.45
6x + 0.4x = 9.6
6x + 0.4x = 16
6x + 18x = 120
3.2x - 1.6x = 8
3.4x - 48 = 26.8
0.32x - 0.5×4 = 0.56
0.48 + x + 7.4 = 9.7
答案
$x = 4.8$
$x = 0.9$
$x = 2.1$
$x = 7.5$
$x = 2.8$
$x = 0.3$
$x = 2$
$x = 2.5$
$x = 1$
$x = 4.4$
$x = 1.45$
$x = 11$
$x = 0.21$
$x = 0.24$
$x = 1$
$x = 18$
$x = 1.2$
$x = 22$
$x = 13$
$x = 3.7$
$x = 1.5$
$x = 2.5$
$x = 5$
$x = 5$
$x = 22$
$x = 8$
$x = 1.82$
$x = 0.9$
$x = 2.1$
$x = 7.5$
$x = 2.8$
$x = 0.3$
$x = 2$
$x = 2.5$
$x = 1$
$x = 4.4$
$x = 1.45$
$x = 11$
$x = 0.21$
$x = 0.24$
$x = 1$
$x = 18$
$x = 1.2$
$x = 22$
$x = 13$
$x = 3.7$
$x = 1.5$
$x = 2.5$
$x = 5$
$x = 5$
$x = 22$
$x = 8$
$x = 1.82$
