1. 390 : (4х + 3) = 26 2. 528 : (5х - 7) = 16
4х + 3 = 390 : 26 5х - 7 = 528 : 16
4х + 3 = 15 5х - 7 = 33
4х = 15 - 3 5х = 33 + 7
4х = 12 5х = 40
х = 12 : 4 х = 40 : 5
х = 3 х = 8
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3. 594 : (8х - 55) = 18 4. 735 : (6х + 17) = 21
8х - 55 = 594 : 18 6х + 17 = 735 : 21
8х - 55 = 33 6х + 17 = 35
8х = 33 + 55 6х = 35 - 17
8х = 88 6х = 18
х = 88 : 8 х = 18 : 6
х = 11 х = 3
1. 390 : (4х + 3) = 26 2. 528 : (5х - 7) = 16
4х + 3 = 390 : 26 5х - 7 = 528 : 16
4х + 3 = 15 5х - 7 = 33
4х = 15 - 3 5х = 33 + 7
4х = 12 5х = 40
х = 12 : 4 х = 40 : 5
х = 3 х = 8
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3. 594 : (8х - 55) = 18 4. 735 : (6х + 17) = 21
8х - 55 = 594 : 18 6х + 17 = 735 : 21
8х - 55 = 33 6х + 17 = 35
8х = 33 + 55 6х = 35 - 17
8х = 88 6х = 18
х = 88 : 8 х = 18 : 6
х = 11 х = 3
1) (3×3)÷9=1
2) (4×5)÷1=20
3) (14×24)÷21=16
4) (6×72)÷8=54
5) (40×27)÷24=45
6) (42×30)÷36=35
7) (3×21)÷9=7
8) (1×24)÷6=4
9) (12×7)÷14=6
10) (3×8)÷24=1
11) (4×7)÷2=14
12) (14×1)÷7=2
13) (3×7)÷1=21
14) (2×21)÷7=6
15) (12×42)÷28=18
16) (6×5)3÷=10