\(9-25=\left(7-x\right)-\left(25+70\right)\)
\(-16=7-x-25-70\)
\(-88-x=-16\)
\(x=-88-\left(-16\right)\)
\(x=-72\)
Vậy \(x=-72\)
9-25=(7-x)-(25+7)
1) (2x -3) (5/2 – x)=0
2) x – 12 = ½
3) (2x + 3/5)^2 -9/25 = 0
4) 7/3 x – 5/2 x = -1/3
5) ¾ + ¼ : x = 1
6) 1/3 + 2/5 (x+1) = 1
Tìm x biết
(x-37).257=258
tính toán,rút gọn
1 \(\dfrac{6^{20}.25^{19}}{8^7.9^{10}.125^{13}}\)
2 ( \(\dfrac{36}{25}\).x8.y5)9 .(\(\dfrac{-125}{216}\).x4.y7)6
3 x15.y17.(\(\dfrac{-15}{7}\))10.(0.04)9
4 1252 .93,26
Bài 1: Tìm X a, 32.(x+4)-52=5.22 b,5x+x=39-311:39 c(3x -24 ).73 =2.74 Bài 2 :tính nhanh a, 66.25+5.66+66.14+33.66 b,125.98-125-46-52+25 c,S1=1+2+3+4+....+99 S2=1+4+7+.....+79 S3=15+25+35+.....+150
1 tìm x ∈ Z
a)3-(17-x)=289-(36+289)
b)25-(x+5)=415-(15-415)
c)/x-7/+13=25
2 rút gọn
a)(a-1)-(a-3)
b)(2+b)-(b+1)
Tính nhanh
A= ( 38 x 333 - 111 x 133 ) x 2018
B = ( 25 + 3 x 75 - 125 x 2 ) : 20182019
C = ( 244 x 395 - 244 x 195 ) : ( 122 x 200 )
D = ( 355 x 45 x 55 ) : ( 11 x 9 x 7)
E = 1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 + ... + 49 x 50
1. So sánh: 2^16 và 3^25
2. Chứng tỏ
a) 7^15-7^14+7^13 chia hết cho 7
b) 5+5^2+5^3+.....+5^9 chia hết cho 151
tìm x,y thuộc z bít:
(32-x)+(-7+|x|)-(|-x|+25)=-45
