35/18:2/5
Tính nhẩm:
16 : 4 =
18 : 2 =
24 : 6 =
6 : 2 =
18 : 6 =
24 : 4 =
12 : 6 =
15 : 5 =
35 : 5 =
Học sinh nhẩm và ghi:
16 : 4 =4
18 : 2 =9
24 : 6 =4
16 : 2 =8
18 : 6 =3
24 : 4 =6
12 : 6 =2
15 : 5 =3
35 : 5 = 7
a) 35 l + 18 l 53 l - 35 l 53 l - 18 l
b) 5 kg x 2 10 kg : 2 10 kg : 5
c) 40 m + 20 m 60 m - 20 m 60 m - 40 m
a/ 35l + 18l = 53l 53l - 35l = 18l 53l - 18l = 35l
b/ 5 kg x 2 = 10 kg 10 kg : 2 = 5 kg 10 kg : 5 = 2 kg
c/ 40 m + 20 m = 60 m 60 m - 20 m = 40 m 60 m - 40 m = 20 m
a) 35l+18l=53l 53l-35l=18l 53l-18l=35l
b)5kgx2=10kg 10kg:2=5kg 10kg:5=2kg
c)40m+20m=60m 60m-20m=40m 60m-40m=20m
1a) 35 l + 18 l=53l 53 l - 35 l=18l 53 l - 18 l=35l`
1b) 5 kg xx 2=10kg 10 kg : 2=5kg 10 kg : 5=2kg`
1c) 40 m + 20 m=60m 60 m - 20 m=40m 60 m - 40 m=20m`
Có thể so sánh 2 số 291 và 535 như sau :
291 > 290 = (25)18 = 3218 > 2518 = (52)18 = 536 > 535
Tìm 1 cách khác để so sánh 2 số trên (tương tự càng tốt)
Ta có : 291 = ( 213 )7 = 81927
535 = ( 55 )7 = 31257
Vì 81927 > 31257 nên 291 > 535
Cbht
5 / 14 + 18 / 35 + ( 5 / 4 - 5 / 4 ) : ( 5/12)^2
5 / 14 + 18 / 35 + ( 5 / 4 - 5 / 4 ) : ( 5/12)^2
= 61 / 70 + 0 : ( 5 / 12)^2
= 61 / 70 + 0
= 61 / 70
(5+1/5-2/9)-(2-1/23-3/35+5/6)-(8+2/7-1/18)
\(\left(5+\dfrac{1}{5}-\dfrac{2}{9}\right)-\left(2-\dfrac{1}{23}-\dfrac{3}{35}+\dfrac{5}{6}\right)-\left(8+\dfrac{2}{7}-\dfrac{1}{18}\right)\)
\(=\left(\dfrac{225}{45}+\dfrac{9}{45}-\dfrac{10}{45}\right)-\left(\dfrac{9660}{4830}-\dfrac{210}{4830}-\dfrac{414}{4830}+\dfrac{4025}{4830}\right)-\left(\dfrac{1008}{126}+\dfrac{36}{126}-\dfrac{7}{126}\right)\)
\(\dfrac{224}{45}-\dfrac{13061}{4830}-\dfrac{1037}{126}=...\)
Tìm x:
5\(^{10}\) : 5\(^8\) + x = 3\(^{20}\) : (-3)\(^{18}\) - 2\(^{35}\) : (-2)\(^{33}\)
\(5^{10}:5^8+x=3^{20}:\left(-3\right)^{18}-2^{35}:\left(-2\right)^{33}\\ \Leftrightarrow5^2+x=3^2+\left(-2\right)^2\\ \Leftrightarrow25+x=13\\ \Leftrightarrow x=-12\)
5^10/5^8+x=3^20/(-3)^18-2^35/(-2)^33
5^2+x=(-3)^2+2^2
25+x= 9+4
25+x=13
x=13-25
x=-12
vậy x=-12
(-1/3)2 x 18 - 35: 33 + (-5) .4
\(\left(-\dfrac{1}{3}\right)^2\).18-35:33+(-5).4
= \(\dfrac{1}{9}\).18-32+(-5).4
=2-9+(-20)
=-27
35:(-5)-7.(5-18)
(-8)^2.3^2
9^2.(-5)^4
35:(-5)-7.(5-18)
=-7-7.(-90)
=-7+630
=623
(-8)2.32=(-8.3)2=(-24)2=576
92.(-5)4
=81.625
=50625
hình như câu đầu bạn làm có vấn đè rồi
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