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a) \(15.4=15.\left(2.2\right)=\left(15.2\right).2=30.2=60\)
\(25.12=25.\left(2.6\right)=\left(25.2\right).6=50.6=300\)
\(125.16=125.\left(2.8\right)=\left(125.8\right).2=1000.2=2000\)
b) \(25.12=25.\left(10+2\right)=25.10+25.2=250+50=300\)
\(34.11=34.\left(10+1\right)=34.10+34.1=340+34=374\)
\(47.101=47.\left(100+1\right)=47.100+47.1=4700+47=4747\)
Chúc em học tốt!!!
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, \(15.\left(4.4\right)=\left(15.4\right).4=60.4=240\)
25.12=25.(4.3)=(25.4).3=100.3=300
125.16=125.(4.4)=(125.4).4=500.4=2000
b, 25.12=25.(10+2)=25.10+25.2=250+50=300
34.11=34.(10+1)=34.10+34.1=340+34=374
47.101=47.(100+1)=47.100+47.1=4700+47=4747
Bài giải:
a) 15 . 4 = 15 . 2 . 2 = 30 . 2 = 60;
25 . 12 = 25 . 4 . 3 = 100 . 3 = 300
125 . 16 = 125 . 8 . 2 = 1000 . 2 = 2000
b) 25 . 12 = 25(10 + 2) = 250 + 50 = 300;
34 . 11 = 34(10 + 1) = 340 + 34 = 374;
47 . 101 = 47(100 + 1) = 4700 + 47 = 4747
a) 17.4=(10+7).4
=10.4+7.4
=40+28
=68
25.28=25.4.7
=(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<(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
a) 125.16 = 125.8.2 = 1000.2 = 2000
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
c) 8.19 = 8.(20 – 1) = 8.20 – 8.1 = 160 – 8 = 152
65.98 = 65.(100 – 2) = 6500 – 130 = 6370
a)86+357+14
=(86+14)+357
=100+357
=457.
b)72+69+128
=(72+128)+69
=200+69
=269.
c)25.5.4.27.2
=25.5.2.4.27
=25.5.8.27
=25.40.27
=1000.27
=27000.
d)28.64+28.36
=28.(64+36)
=28.100
=2800.
a, (86+14)+357
=100+357
=457
b,(72+128)+69
=200+69
=269
c,(25.4).(5.2).27
=100.10.27
=27000
d,28.(64+36)
=28.100
=2800
a)
17.4 = 17.2.2 = ( 17.2 ) .2 = 34.2 = 68
25.28 = 25 . 4 .7 = (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, 17 . 4 = 17 . 2 . 2 = ( 17 . 2 ) . 2 = 34 . 2 = 68
25 . 28 = 25 . 4 . 7 = ( 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