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137 x 3 + 137 x 97
= 137 x ( 97 + 3 )
= 137 x 100
= 13700
Chúc bạn học tốt !!!
\(5\times4\times2\times25\)
\(=\left(5\times2\right)\times\left(4\times25\right)\)
\(=10\times100=1000\)
________
\(138\times8+2\times138\)
\(=138\times\left(8+2\right)\)
\(=138\times10=1380\)
5×4×2×255×4×2×25
=(5×2)×(4×25)
=10×100
=1000
138×8+2×138138×8+2×138
=138×(8+2)=138×(8+2)
=138×10=1380
a) \(\dfrac{5}{9}+\dfrac{13}{7}+\dfrac{15}{13}+\dfrac{8}{7}+\dfrac{4}{9}+\dfrac{11}{13}\)
\(=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\left(\dfrac{13}{7}+\dfrac{8}{7}\right)+\left(\dfrac{15}{13}+\dfrac{11}{13}\right)\)
\(=1+3+2\)
\(=6\)
b) \(\dfrac{3}{5}+\dfrac{18}{9}+\dfrac{4}{10}\)
\(=0,6+2+0,4\)
\(=\left(0,6+0,4\right)+2\)
\(=1+2\)
\(=3\)
\(a\dfrac{5}{9}+\dfrac{4}{9}+\dfrac{13}{7}+\dfrac{8}{7}+\dfrac{15}{13}+\dfrac{11}{13}=\dfrac{9}{9}+\dfrac{21}{7}+\dfrac{26}{13}=1+3+2=6\)
a)12 x 11 + 21 x 11 x 11 + 11 x 33
= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )
= 132+2541+363132+2541+363
= 30363036
b)132x11-11x32-54x11
= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )
=1452−352−594=1452−352−594
= 506506
\(a,=11\times\left(12+21+33\right)=11\times66=726\\ b,=11\times\left(132-32-54\right)=11\times46=506\\ c,=11\times\left(245+365\right)=11\times610=6710\\ d,=75\times\left(78+89+123\right)=75\times290=21750\\ e,=\left(2\times50\right)\times\left(250\times8\right)=100\times2000=200000\\ g,=1994\times\left(867+11\right)=1994\times878=1750732\)
A , 137 x3+137 x97
=137 x (97+3)
=137 x 100
=13700
B,428x12-428x2
=428x(12-2)
=428x10
=4280
A, = 137 x ( 3 + 97 )
= 137 x 100
= 13 700
B, = 428 x ( 12 - 2 )
= 428 x 10
= 4 280