45+25=
45+45+25+25+25
45 + 45 + 25 + 25 + 25
= 45 x 2 + 25 x 3
= 90 + 75
= 165
mình ko biêt scaau này
ai giúp mình với
Bài 1.2: Tính nhanh:
5+ 5 + 5 + 5+ 5 + 5 +5+ 5 + 5 +5
25 + 25 + 25 + 25 + 25 + 25 +25 + 25
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18
125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
5+ 5 + 5 + 5+ 5 + 5 +5+ 5 + 5 +5=5x10=50
25 + 25 + 25 + 25 + 25 + 25 +25 + 25=25x8=200
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15=(45x4)+(15x4)=180+60=240
5+ 5 + 5 + 5+ 5 + 5 +5+ 5 + 5 +5
= 5 x 10
= 50
25 + 25 + 25 + 25 + 25 + 25 +25 + 25
= 25 x 8
= 200
45 + 45 + 45 + 45 + 15 + 15 + 15 + 15
= 45 x 4 + 15 x 4
= 180 + 60
= 240
2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18
= (2 + 18) + (4 + 16) + (8 + 12) + (6 + 14) + 10
= 20 + 20 + 20 + 20 + 10
= 20 x 4 + 10
= 80 + 10
= 90
125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= 4 x (125 - 25)
= 4 x 100
= 400
(Tick cho mk pls ^^)
25+25+25+25+50+50+45+45+30+40+10
25+25+25+25+50+50+45+45+30+40+10
= 25 x 4 + 50 x 2 + 45 x 2 + (30 + 40 + 10)
= 100 + 100 + 90 + 80
= 200 + 170
= 370
25*4*100*25*4*45*45*25*2
Viết tiếp vào chổ trống:
N h ậ n x é t : 2 3 × 4 5 = . . . , 4 3 × 2 3 = . . . . V ậ y 2 3 × 4 5 . . . . . . 4 5 × 2 3 N h ậ n x é t : ( 1 3 × 2 5 ) × 3 4 = . . . . 1 3 × ( 2 5 × 3 4 ) = . . . . ( 1 3 × 2 5 ) × 3 4 . . . . 1 3 × ( 2 5 × 3 4 ) N h ậ n x é t : ( 1 5 × 2 5 ) × 3 4 = . . . . 1 5 × 3 4 + 2 5 × 3 4 = . . . . V ậ y 1 5 + 2 5 × 3 4 . . . 1 5 × 3 4 + 2 5 × 3 4
tình nhanh
45+25+45+25+10
`45+25+45+25+10`
`=(45+45+10)+(25+25)`
`=100+50`
`=150`
45 + 25 + 45 + 25 + 10
= ( 45 + 45 + 10 ) + ( 25 + 25)
= 100 + 50
= 150
=(45+45)+(25+25)+10
= (95+50)+10
=145+10
=155
tính nhanh
a 45+20+45+20+50+30
b 50+25+50+45+25
a) 45+20+45+20+50+30
= (50+20+30)+(45+45+20)
= 100+110
=210
b) 50+25+50+45+25
= (50+50)+(25+25)+45
=100+50+45
=150+45
=195
a) 45+20+45+20+50+30
=(45+45)+(20+20)+30+50
=(90+40)+30+50
=130+80
=210
b)50+25+50+45+25
=(50+50)+(25+25)+45
=(100+50)+45
=150+45
=195
tính nhanh
a) 45+45+45+45+15+15+15+15=
b) 125+125+125+125-25-25-25-25=
c) (145x99+145) -( 143x102-143) =
d) 54x47-47x53-20-27=
e)326x728+327x272=
a.45+45+45+45+15+15+15+15=45×4+15×4=4×(45+15)=4×60=240
125+125+125+125-25-25-25-25=125×4-25×4=4×(125-25)=4×100=400
(-25).(75-45)-75.(45-25)
(-25).(75 - 45) - 75.(45 - 25)
= [(-25).75 - (-25).45] - (75.45 - 75.25)
= (-25).75 + 25.45 - 75.45 + 75.25
= [(-25).75 + 75.25) - (75.45 - 25.45)
= 0 - 45.(75 - 25)
= -45.50
= -2250
(-25) × (75-45) - 75×(45×25)
\(\left(-25\right)\times\left(75-45\right)-75\times\left(45\times25\right)\)\(=\) \(\left(-25\right)\times30-75\times1125\)
\(=\left(-750\right)-84375\)
\(=-85125\)
= (- 25) . 30 - 75 . 1125
= -750 - 84375
= -82125
Ủng hộ mik nha