Tìm x, biết: (a) 10 + x = 320; (b) 24 – x = 14; (c) 2x + 5 = 15; (d) x : 6 = 19.
Giải thích
a) 10 + x = 320
x = 320 – 10
x = 310
b) 24 x = 14
x = 24 – 14
x = 10
c) 2x + 5 = 15
2x = 15 – 5
2x = 10
x = 10:2
x = 5
d) x = 19.6
x = 114
a) 10 + x = 320
x = 320 – 10
x = 310
b) 24 x = 14
x = 24 – 14
x = 10
c) 2x + 5 = 15
2x = 15 – 5
2x = 10
x = 10:2
x = 5
d) x = 19.6
x = 114