4+3*5/2-5+69*754-425*13-139*2+67/25*796-425+4652*2439/3341+342/653894-426*46341
1) Chứng minh rằng các số sau đây là hợp số
a) 1+2^7+3^11+5^13+7^17+11^19
b) 21^123+23^124+25
c) 425^25-37^15
d) 195^354-151^25
TÍNH NHANH 425×32+69×425-425=? Làm nhanh cho em với ạ
425 x 32 + 69 x 425 - 425
= 425 x 32 + 69 x 425 - 425 x 1
= 425 x (32+69-1)
= 425 x 100
= 42500
chuyển các phân số sau thành phân số thập phân
a 2/5 7/4 18/25 b 32/80 72/400 425/5000
2/5 = 4/10
7/4 = 175/100
18/25 = 72/100
32/80 = 4/10
72/400 = 18/100
425/5000 = 85/1000
chúc bn học tốt .
# MissyGirl #
a) 2/5 = 4/10
7/4 = 175/100
18/25 = 72/100
b) 32/80 = 4/10
72/400 = 18/100
425/5000 = 85/1000
\(\frac{2}{5}\)=\(\frac{4}{10}\)
\(\frac{7}{4}\)=\(\frac{175}{100}\)
\(\frac{18}{25}\)=\(\frac{72}{100}\)
\(\frac{32}{80}\)=\(\frac{4}{10}\)
\(\frac{72}{400}\)=\(\frac{18}{100}\)
\(\frac{425}{5000}\)=\(\frac{85}{1000}\)
K nhé?
Bài 1: Tìm x ,biết
1, 155 -10× (x+1) =55
2, 5×(x+12) +15 = 15 625 ÷425
3, 10 +12 +14 +... +98 -2x =100
Bài 2: Tính
1, 5 ×25 -18 ÷9
2, 17 ×85 +15 ×17 -120
3, 8 -125 ÷25 +12 ×4
bài 1
a) 155 - 10.(x+1) = 55
=>10 .(x+1) = 100
=>x + 1 = 10
=>x = 9
còn lại tương tự
Tính nhanh:
17/5*-31/125*1/2*10/17*-1/2^3
tính bằng cách thuận tiện nhất
5,5+3/4-5+1/4
5/2x2/3+1/4:3/2
tính x ;
435-[ x +16]=425: 17
x x 1/4-3/4=6:3/4
x +2 3/4=5 2/3
5,5 + \(\dfrac{3}{4}\) - 5 + \(\dfrac{1}{4}\)
(5,5 - 5) + (\(\dfrac{3}{4}\) + \(\dfrac{1}{4}\))
= 0,5 + 1
= 1,5
\(\dfrac{5}{2}\) x \(\dfrac{2}{3}\) + \(\dfrac{1}{4}\) : \(\dfrac{3}{2}\)
= \(\dfrac{5}{2}\) x \(\dfrac{2}{3}\) + \(\dfrac{1}{4}\) x \(\dfrac{2}{3}\)
= (\(\dfrac{5}{2}\) + \(\dfrac{1}{4}\)) x \(\dfrac{2}{3}\)
= (\(\dfrac{10}{4}\) + \(\dfrac{1}{4}\)) x \(\dfrac{2}{3}\)
= \(\dfrac{11}{4}\) x \(\dfrac{2}{3}\)
= \(\dfrac{11}{6}\)
Tính \(x\):
435 - [\(x\) + 16] = 425 : 17
435 - [\(x\) + 16] = 25
[\(x\) + 16] = 435 - 25
\(x\) + 16 = 410
\(x\) = 410 - 16
\(x\) = 394
\(x\) x \(\dfrac{1}{4}\) - \(\dfrac{3}{4}\) = 6 : \(\dfrac{3}{4}\)
\(x\) \(\times\) \(\dfrac{1}{4}\) - \(\dfrac{3}{4}\) = 6 x \(\dfrac{4}{3}\)
\(x\) x \(\dfrac{1}{4}\) - \(\dfrac{3}{4}\) = 8
\(x\) x \(\dfrac{1}{4}\) = 8 + \(\dfrac{3}{4}\)
\(x\) x \(\dfrac{1}{4}\) = \(\dfrac{32}{4}\) + \(\dfrac{3}{4}\)
\(x\) x \(\dfrac{1}{4}\) = \(\dfrac{35}{4}\)
\(x\) = \(\dfrac{35}{4}\) : \(\dfrac{1}{4}\)
\(x\) = \(\dfrac{35}{4}\) x 4
\(x\) = 35
Tính:
a) 0 , ( 3 ) + 3 1 3 + 0 , 4 ( 2 )
b) 4 9 + 1 , 2 ( 31 ) − 0 , ( 13 )
c) 12 , 1 − 2 , 3 ( 6 ) : 4 , ( 21 )
d) 2 1 2 − 3 , 4 ( 12 ) − 4 3 + 1 3 . 1 2 + 0 , 5 − 3 1 2
e) 0 , ( 5 ) .0 , ( 2 ) : 3 1 3 : 33 25 − 2 5 .1 1 3 : 4 3
f) 0 , 4 3 + 0 , 6 ( 2 ) .2 1 2 − 1 2 + 1 3 0 , 5 ( 8 ) : 50 53
g) 3 1 2 . 4 49 − 2 , 4 .2 5 11 : − 42 5
a : (1/2 + 1/10 + 3/5 )= 425
a:(1/2+1/10+3/5)=425
<=>a:6/5=425
<=>a=425.6/5
<=>a=510
\(a:\left(\frac{1}{2}+\frac{1}{10}+\frac{3}{5}\right)=425\)
\(a:\frac{6}{5}=425\)
\(a=425\times\frac{6}{5}\)
\(a=510\)
\(a:\left(\frac{1}{2}+\frac{1}{10}+\frac{3}{5}\right)=425\)
\(=>a:\left(\frac{5}{10}+\frac{1}{10}+\frac{6}{10}\right)=425\)
\(=>a:\frac{6}{5}=425\)
\(=>a=425.\frac{6}{5}=\frac{2550}{5}=510\)
Câu 1: (X - 320) × 342 = 5472
Câu 2: 6072 : ( 425 - X ) = 253
(X-320)x342=5472
X-320=5472:342
X-320=16
X=16+320
X=336
Câu 2:6072:(425-X)=253
425-X=6072:253
425-X=24
X=425-24
X=401
CMR các số sau chia hết cho 2:
a, A=27+311+513+717+1110
b, B=21123+23124+25125
c, C=42525-3715
Mình có 2 nic làm đúng mình sẽ cho 2 click