Tìm x
a,2^3.x+5^2.x=2.5^2+2^3-33
b,15:x+2=3^3+3:10
c,2^2+3.x-5+14+5^2+124:2^2
Tìm x a,2^3.x+5^2.x=2.5^2+2^3-33 b,15:x+2=3^3+3:10 c,2^2+3.x-5+14+5^2+124:2^2
By Mackenzie
By Mackenzie
Tìm x
a,2^3.x+5^2.x=2.5^2+2^3-33
b,15:x+2=3^3+3:10
c,2^2+3.x-5+14+5^2+124:2^2
Đáp án:
Giải thích các bước giải:
a)2³.x+5².x=2.5²+2³-33
x.(8+25)=2.25+8-33
x.33=50+8-33
33x=25
x=25/33
b)15:x+2=3³+3:10
15:x+2=27+3:10
15:x+2=27+0,3
15:x+2=27,3
15:x=27,3-2=25,3
x=15:25,3=15/25,3
c)2²+3.x-5+14+5²+124:2²
(sai đề phải ko?)
a,2³.x+5².x=2.5²+2³-33
⇔ x(2³ + 5²) = 2 . 25 + 8 – 33
⇔ x . (8 + 10) = 25
⇔ x . 18 = 25
⇔ x = $\frac{25}{18}$
b,15:x+2=3³+3:10
⇔ 15 : x = 3³ + 3 : 10 – 2
⇔ 15 : x = $\frac{250}{10}$
⇔ x = $\frac{3}{5}$
c,2² + 3.x – 5 + 14 + 5² + 124 : 2²
???
Phần c sai đề ak?