225 : 15 -15 :3
225 :15+3.(2x1)=270
\(225:15+3\left(2x-1\right)=270\)
\(\Leftrightarrow2x-1=85\)
hay x=43
225 :15 3.(2x+1) 270
\(3\left(2x+1\right)=270\)
\(\Leftrightarrow2x+1=90\)
hay \(x=\dfrac{89}{2}\)
Tính
5⁶ : 5³ +2³ :2²
3333 : 3 + 225 : 15
15 . 2³ + 4.3² -5.7
5.4² - 18 : 3²
6² : 4.3 + 2.5³
80 - ( 4.5² - 3.2³)
Lời giải:
a.
$=5^{6-3}+2^{3-2}=5^3+2^1=125+2=127$
b.
$=3333:3+225:15=1111+15=1126$
c.
$=15.2^3+4.3^2-5.7=15.8+4.9-35=120+36-35=120+1=121$
d.
$=5.4^2-18:3^2=5.16-18:9=80-2=78$
e.
$=6^2:4.3+2.5^3=36:4.3+2.125$
$=9.3+250=27+250=277$
f.
$=80-(4.25-3.8)=80-(100-24)=80-100+24=-20+24=4$
Tính
5⁶ : 5³ +2³ :2²
3333 : 3 + 225 : 15
15 . 2³ + 4.3² -5.7
5.4² - 18 : 3²
6² : 4.3 + 2.5³
80 - ( 4.5² - 3.2³)
333:3+225 :15 mũ 2
\(333:3+225:15^2\)
\(=111+225:15\cdot15\)
\(=111+225:225\)
\(=111+1\)
\(=112\)
(225-7^2)(225-10^2)(225-9^2)(225-15^2) mình cần gấp
so sánh
\(a.3\sqrt{26}\) và 15
\(b.-5\sqrt{35}\) và 30
c.\(\sqrt{34-10\sqrt{3}}\) và 5-\(\sqrt{3}\)
d.\(\sqrt{16+225}\) và \(\sqrt{16}+\sqrt{225}\)
(225-52).(225-62).....(225-152)
(225-52)(225-62)................................(225-152)
(225 - 52).(225 - 62) . ... .(225 - 152)
\(\left(225-5^2\right)\left(225-6^2\right).....\left(225-15^2\right)\)
\(=\left(225-5^2\right)\left(225-6^2\right).....\left(15+15\right)\left(15-15\right)\)
\(=\left(225-5^2\right)\left(225-6^2\right).....\left(15+15\right).0=0\)
Vậy.................
Chúc bạn học tốt!!!