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a) 36.2+36.3+36.5=36.(2+3+5)=36.10=360
b) 201+201.2+201.3+201.4=201.(1+2+3+4)=201.10=2010
Dấu . là nhân nhé
a ) 36 x 2 + 36 x 3 + 36 x 5
= 36 x ( 2 + 3 + 5 )
= 36 x 10
= 360
b ) 201 + 201 x 2 + 201 x 3 + 201 x 4
= 201 x 1 + 201 x 2 + 201 x 3 + 201 x 4
= 201 x ( 1 + 2 + 3 + 4 )
= 201 x 10
= 2010
SO so hang la :
( 37 - 2 ):1+1=36 ( SSH )
SO S la :
( 37+2 ) x36 :2=702
đap so : 702
120+[1+2+3...+9+100]x[4x9-36]
=120+1+2+3...+9+100]x0
=120+0
=120
\(\frac{3}{8}+\frac{15}{32}=\frac{12}{32}+\frac{15}{32}=\frac{27}{32}\)
\(\frac{8}{9}-\frac{5}{36}=\frac{32}{36}-\frac{5}{36}=\frac{27}{36}=\frac{3}{4}\)
\(\frac{15}{6}-\frac{7}{4}+2=\frac{30}{12}-\frac{28}{12}+\frac{24}{12}=\frac{26}{12}=\frac{13}{6}\)
\(3-\left(\frac{3}{4}+\frac{5}{12}\right)=3-\left(\frac{9}{12}+\frac{5}{12}\right)=3-\frac{14}{12}=3-\frac{7}{6}=\frac{18}{6}-\frac{7}{6}=\frac{11}{6}\)
A = (2 + 22) + (23 + 24 ) +…(2199 + 2200)
A = 6 + 22 (2 + 22 ) +… + 2198 (2 + 22)
A = 6 + 22 (6 ) +… + 2198 (6)
A = 6(1 + 22 +… + 2198)
Vậy A chia hết cho 6
a) \(\left(\frac{2}{7}+\frac{3}{8}+\frac{12}{7}+\frac{5}{8}\right).\frac{19}{36}\)
\(=\left\{\left(\frac{2}{7}+\frac{12}{7}\right)+\left(\frac{3}{8}+\frac{5}{8}\right)\right\}.\frac{19}{36}\)
\(=\left(\frac{14}{7}+\frac{8}{8}\right).\frac{19}{36}\)
\(=\left(2+1\right).\frac{19}{36}\)
\(3.\frac{19}{36}=\frac{19}{12}\)
\(12\times9-12\times3\)
\(=12\times\left(9-3\right)\)
\(=12\times6\)
\(=72\)
\(36:2+36:3\)
\(=36:\left(2+3\right)\)
\(=36:5=\frac{36}{5}=7,2\)
a.
1+2+3+...+99+100
=(1+100)*100/2
=5050
b.12+14+16+...+38
=(12+38)*[(38-12)/2+1]/2
=350
Tính nhanh :
\(a.1+2+3+...+98+99+100\)
\(=\left(100+1\right).100:2\)
\(=101.100:2\)
\(=10100:2\)
\(=5050\)
\(b.16.48+8.48+16.28\)
\(=48.\left(16+8\right)+16.28\)
\(=48.24+16.28\)
\(=1152+448\)
\(=1600\)
36 : 2/3 = 54
54 nha