Ответ:
3 . 12÷7=9÷х
12х=7×9=63
х=63÷12
х=5,25
4. 6,5÷5,2=х÷8
5,2х=6,5×8=52
х= 52÷5,2
х=10
5. 4,5÷3,6=х÷4
3,6х=4,5×4=18
х=18÷3,6
х=5
6. 15÷4=х÷1 1/3
4х= 15×1 1/3
4х= 15×4/3=60/3=20
х= 20÷4
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Ответ:
3 . 12÷7=9÷х
12х=7×9=63
х=63÷12
х=5,25
4. 6,5÷5,2=х÷8
5,2х=6,5×8=52
х= 52÷5,2
х=10
5. 4,5÷3,6=х÷4
3,6х=4,5×4=18
х=18÷3,6
х=5
6. 15÷4=х÷1 1/3
4х= 15×1 1/3
4х= 15×4/3=60/3=20
х= 20÷4
х=5