a. x - 1/ 2 - 7x + 3/15 nhỏ hơn bằng 2x + 1/3 + 3 - 2x/5
Giải thích
a. x−12−7x+315≤2x+13+3−2x5
⇔15.x−130−2.7x+330≤10.2x+130+6.3−2x30⇔15x−15−14x−6≤20x+10+18−12x⇔x−21≤8x+28⇔7x≥−49⇔x≥−7
Vậy S=xx≥−7.
a. x−12−7x+315≤2x+13+3−2x5
⇔15.x−130−2.7x+330≤10.2x+130+6.3−2x30⇔15x−15−14x−6≤20x+10+18−12x⇔x−21≤8x+28⇔7x≥−49⇔x≥−7
Vậy S=xx≥−7.