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a) 27x6 = 3*9*6 = 162
b) 99x4 = 11x9x4 = 396
c) 125x16 = 5x5x5x4x4=2000
\(35x4=\left(25+15\right)x4=100+60\)\(=160\)
\(25x36=25x4x9=100x9=900\)
\(35\times4=140\)
\(25\times36=900\)
\(36\times12=432\)
\(75\times11=825\)
\(67\times101=6767\)
a ) 17 x 4 = ( 15 + 2 ) x 4 = 15 x 4 + 2 x 4 = 60 + 8 = 68
25 x 28 = 25 x ( 20 + 8 ) = 25 x 20 + 25 x 8 = 500 + 200 = 700
b ) 13 x 12 = 13 x ( 10 + 2 ) = 13 x 10 + 13 x 2 = 130 + 26 = 156
53 x 11 = 53 x ( 10 + 1 ) = 53 x 10 + 53 x 1 = 530 + 53 = 583
39 x 101 = 39 x ( 100 + 1 ) = 39 x 100 + 39 x 1 = 3900 + 39 = 3939
a) Ta có:
\(17\times4=\left(15+2\right)\times4=15\times4+2\times4=60+8=68\)
\(25\times28=25\times\left(20+8\right)=25\times20+25\times8=500+200=700\)
b) Ta có:
\(13\times12=13\times\left(10+2\right)=13\times10+13\times2=130+26=156\)
\(53\times11=53\times\left(10+1\right)=53\times10+53\times1=530+53=583\)
\(39\times101=39\times\left(100+1\right)=39\times100+39\times1=3900+39=3939\)
a, 98+19=98+(2+17)
=(98+2)+17
=100+17
=117
b, 58+397=(55+3)+397
=55+(3+397)
=55+400
=455
c, 49+194=(43+6)+194
=43+(6+194)
=43+200
=243
d, 592+48=592+(8+40)
=(592+8)+40
=600+40
=640
e, 997+35=997+(3+32)
=(997+3)+32
=1000+32
=1032
f, 1994+257=1994+(6+251)
=(1994+6)+251
=2000+251
=2251
98+(2+17)
(98+2)+17=100+17=117
b/55+3+397=55+400=455
c/43+6+194=43+200=243
d/592+40+8=600+40=640
e/997+3+32=1000+32=1032
f/1994+251+6=2000+251=2251
a<(15+3).4=15.4+3.4=60+12=72
25.(10+10+8)=25.10+25.10+25.8=250+250+200=700
b) (10+3).12=10.12+3.12=120+36=156
53.11=53.(10+1)=53.10+53.1=530+53=583
39.101=39.(100+1)=39.100+39=390+39=429
cau a lam dai :))
a, 1597 + 65 = 1535 + 65 + 62
= 1600 + 62 = 1662
b, 86 + 269 = 55 + 31 + 269
= 55 + 300 = 355
xin tiick
a, 17 . 4 = 17 . 2 . 2 = 34 . 2 = 68
25 . 28 = 25 . 4 . 7 = 100 . 7 = 700
b, 13 . 12 = 13 . ( 10 + 2 ) = 13 . 10 + 13 . 2 = 130 + 26 = 156
53 . 11 = 53 . ( 10 + 1 ) = 53 . 10 + 53 . 1 = 530 + 53 = 583
39 . 101 = 39 . ( 100 + 1 ) = 39 . 100 + 39 . 1 = 3900 + 39 = 3939
a, 38+88=(30+80)+(8+8)
=110+16
=128 (nhẩm đó)
b,97+87= (90+80)+(7+7)
=170+14
=184 (nhẩm thật)
c, 36+76=(30+70)+(6+6)
=100+12
=112 (nhẩm thiệt)
A) 38+88=(30+80)+(8+8)
=110+16
=128
B)97+87= (90+80)+(7+7)
=170+14
=184
C) 36+76=(30+70)+(6+6)
=100+12
=112