1.
1/5 х = 13,
х = 13 : 1/5,
х = 13 * 5/1,
х = 65,
8х + 0,5 = 2,1,
8х = 2,1 - 0,5,
8х = 1,6,
х = 0,2,
13х - 15 = 7х - 5,
13х - 7х = 15 - 5,
6х = 10,
х = 10/6,
х = 1 2/3,
15 - (3х - 1) = 40,
3х - 1 = 15 - 40,
3х - 1 = -25,
3х = -25 + 1,
3х = -24,
х = -8,
2.
(-9,18 : 3,4 - 3,7) * 2,1 + 2,04 = -11,4,
1) -9,18 : 3,4 = -2,7,
2) -2,7 - 3,7 = -6,4,
3) -6,4 * 2,1 = -13,44,
4) -13,44 + 2,04 = -11,4
1.
1/5 х = 13,
х = 13 : 1/5,
х = 13 * 5/1,
х = 65,
8х + 0,5 = 2,1,
8х = 2,1 - 0,5,
8х = 1,6,
х = 0,2,
13х - 15 = 7х - 5,
13х - 7х = 15 - 5,
6х = 10,
х = 10/6,
х = 1 2/3,
15 - (3х - 1) = 40,
3х - 1 = 15 - 40,
3х - 1 = -25,
3х = -25 + 1,
3х = -24,
х = -8,
2.
(-9,18 : 3,4 - 3,7) * 2,1 + 2,04 = -11,4,
1) -9,18 : 3,4 = -2,7,
2) -2,7 - 3,7 = -6,4,
3) -6,4 * 2,1 = -13,44,
4) -13,44 + 2,04 = -11,4