1) 2 2/3х - 5,1 = 3,7;
2 2/3x = 3,7 + 5,1;
2 2/3x = 8,8;
x = 8,8 ÷ 2 2/3;
x = 8 4/5 ÷ 2 2/3;
x = 44/5 ÷ 8/3;
x = 44 × 3/5 × 8;
x = 11 × 3/5 × 2;
x = 33/10;
x = 3,3.
ответ: 3,3.
2) 1,5х + 2 1/3 = 2,5;
1,5x = 2,5 - 2 1/3;
1,5x = 2 1/2 - 2 1/3;
1,5x = 2 3/6 - 2 2/6;
1,5x = 1/6;
x = 1/6 ÷ 1,5;
x = 1/6 ÷ 1 1/2;
x = 1/6 ÷ 3/2;
x = 1 × 2/6 × 3;
x = 1 × 1/3 × 3;
x = 1/9.
ответ: 1/9.
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80х-153=111
80х=111+153
80х=264
х=33/10 или 3,3
2) 1,5х+7/3=2,5
1,5х=2,5-7/3
1,5х=5/2-7/3
1,5х=1/6
х=1/9
1) 2 2/3х - 5,1 = 3,7;
2 2/3x = 3,7 + 5,1;
2 2/3x = 8,8;
x = 8,8 ÷ 2 2/3;
x = 8 4/5 ÷ 2 2/3;
x = 44/5 ÷ 8/3;
x = 44 × 3/5 × 8;
x = 11 × 3/5 × 2;
x = 33/10;
x = 3,3.
ответ: 3,3.
2) 1,5х + 2 1/3 = 2,5;
1,5x = 2,5 - 2 1/3;
1,5x = 2 1/2 - 2 1/3;
1,5x = 2 3/6 - 2 2/6;
1,5x = 1/6;
x = 1/6 ÷ 1,5;
x = 1/6 ÷ 1 1/2;
x = 1/6 ÷ 3/2;
x = 1 × 2/6 × 3;
x = 1 × 1/3 × 3;
x = 1/9.
ответ: 1/9.
Удачи Вам! :)