0.4x-3.8=7.4 1.6×5+2x=12.6 3.2x+2.8x=4.8 【x-5]x8=5.6 13【2x+3x】=169
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0.4x - 3.8 = 7.4
0.4x = 7.4 + 3.8
0.4x = 11.2
x = 11.2 ÷ 0.4
x = 28
1.6 × 5 + 2x = 12.6
8 + 2x = 12.6
2x = 12.6 - 8
2x = 4.6
x = 4.6 ÷ 2
x = 2.3
3.2x + 2.8x = 4.8
6x = 4.8
x = 4.8 ÷ 6
x = 0.8
(x - 5) × 8 = 5.6
x - 5 = 5.6 ÷ 8
x - 5 = 0.7
x = 0.7 + 5
x = 5.7
13(2x + 3x) = 169
5x = 169 ÷ 13
5x = 13
x = 13 ÷ 5
x = 2.6
希望采纳
0.4x = 7.4 + 3.8
0.4x = 11.2
x = 11.2 ÷ 0.4
x = 28
1.6 × 5 + 2x = 12.6
8 + 2x = 12.6
2x = 12.6 - 8
2x = 4.6
x = 4.6 ÷ 2
x = 2.3
3.2x + 2.8x = 4.8
6x = 4.8
x = 4.8 ÷ 6
x = 0.8
(x - 5) × 8 = 5.6
x - 5 = 5.6 ÷ 8
x - 5 = 0.7
x = 0.7 + 5
x = 5.7
13(2x + 3x) = 169
5x = 169 ÷ 13
5x = 13
x = 13 ÷ 5
x = 2.6
希望采纳
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0.4x - 3.8 = 7.4
0.4x = 7.4 + 3.8
0.4x = 11.2
x = 11.2 ÷ 0.4
x = 28
1.6 × 5 + 2x = 12.6
8 + 2x = 12.6
2x = 12.6 - 8
2x = 4.6
x = 4.6 ÷ 2
x = 2.3
3.2x + 2.8x = 4.8
6x = 4.8
x = 4.8 ÷ 6
x = 0.8
(x - 5) × 8 = 5.6
x - 5 = 5.6 ÷ 8
x - 5 = 0.7
x = 0.7 + 5
x = 5.7
13(2x + 3x) = 169
5x = 169 ÷ 13
5x = 13
x = 13 ÷ 5
x = 2.6
0.4x = 7.4 + 3.8
0.4x = 11.2
x = 11.2 ÷ 0.4
x = 28
1.6 × 5 + 2x = 12.6
8 + 2x = 12.6
2x = 12.6 - 8
2x = 4.6
x = 4.6 ÷ 2
x = 2.3
3.2x + 2.8x = 4.8
6x = 4.8
x = 4.8 ÷ 6
x = 0.8
(x - 5) × 8 = 5.6
x - 5 = 5.6 ÷ 8
x - 5 = 0.7
x = 0.7 + 5
x = 5.7
13(2x + 3x) = 169
5x = 169 ÷ 13
5x = 13
x = 13 ÷ 5
x = 2.6
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