Х+187÷11=21 16×25-28х=612÷3; 27÷х+405÷9=48; 581÷83+÷х=24; 216÷х+16×18=324; 24х-345÷23=105

Х+187÷11=21. х+17=21. х=21-17. х=4; 16×25-28х=612÷3. 400-28х=204. -28х=204-400. -28х=-196. 28х=196. х=196÷28. х=7; 27÷х+405÷9=48. 27÷х+45=48. 27÷х=48-45. 27÷х=3. х=27÷3. х=9; 581÷83+х=24 7+х=24. х=24-7. х=17; 216÷х+16×18=324. 216÷х+288=324. 216÷х=324-288. 216÷х=36. х=6; 24х-345÷23=105. 24х-15=105. 24х=105+15. 24х=120. х=5.

X+187÷11=21
1) 187÷11=117
2)21-17=4
x=4
4+187÷11=21
27÷x+405÷9=48
1)48-45=3
2)27÷3=9
x=9
27÷9+405÷9=48