Question

решите уравнение x+187÷11=21; 16×25-28x=612÷3; 27÷x+405÷9=48

Answer 1

Х+187÷11=21 Х+17=21 Х=21-17 Х=4 16×25-28х=612÷3 400-28х=204 28х=400-204 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