Question

Tìm x, biết:

a. 113 + 142 + x = 999 – 103

b. x – 124 = 400 + 56

c. 963 – x = 869 – 28 : 4

Answer 1

a. 113 + 142 + x = 999 – 103

255 + x = 896

x = 896 – 255

x = 641

b. x – 124 = 400 + 56

x – 124 = 456

x = 456 + 124

x = 580

c. 963 – x = 869 – 28 : 4

963 – x = 869 – 7

963 – x = 862

x = 963 – 862

x = 101