tinh nhanh:
a,17.85+15.17-120
b.2.31.12+4.42.6+8.81
c.8.17-8.14+3.42
d.4.15.17+5.12.17+6.10.56
4.15.17+5.12.17+6.10.56
4.15.17=1020
5.12.17=1020
6.10.56=3360
4.15.17+5.12.17+6.10.56=1020+1020+3360=5400
K nhé MN?????????
Hok tốt!!!!!!!
4 . 15 . 17 + 5 . 12 . 17 + 6 . 10 . 56
= 17 . ( 4 . 15 + 5 . 12 ) + 6 . 10 . 56
= 17 . ( 60 + 60 ) + 6 . 10 . 56
= 17 . 120 + 6 . 10 . 56
= 2040 + 3360
= 5400
4.15.17 + 5.12.17 + 6.10.56
= 60.17 + 60.17 + 60.56
= 60( 17 + 17 + 56 )
= 60 . 90
= 5400
1.So sánh: 3.tinh nhanh:(hoac tinh binh thuong^^)
a.63^15&34^18 a.17.85+15.17-120
b.83^9&26^12 b.2.31.12+4.42.6+8.81
(CÁC BN TÁCH RA GIÙM M NHÉ) c.8.17-8.14+3.42
2.tìm x: d.4.15.17+5.12.27+6.10.56
x+2.x+3.x=...+100.x=15150
Thực hiện phép tính:
a. 17.85 + 15.17 - 120
b. 5.72 - 24:23
c. 33.22 - 27.19
a. `17.85+15.17-120`
`=17 . (85+15)-120`
`=17 . 100-120`
`=1700-120`
`=1580`
b. `5.7^2 - 24 : 2^3`
`=5. 49 - 24: 8`
`=245-3`
`=242`
c. `3^3 .22 -27.19`
`=27.22 - 27.19`
`=27 . (22-19)`
`=27.3=81`
a. 17.85 + 15.17 - 120
=17(85+15)-120
=17.100-120
=1700-120
=1580
b. 5.72 - 24:23
=5.49-24:8
=245-3
=242
c. 33.22 - 27.19
=27.22-27.19
=27(22-19)
=81
thực hiện phép tính (tính nhanh nếu có thể )
a)17.85+15.17-120
b)27.77+24.27-27
c)2 mũ 3 .17- 2 mũ 3 .14
d)35.48 +65.68 +20.35
cần gấp giu mình nhanh chóng mik cảm ơn
a: =17x100-120=1700-120=1580
a) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
b) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)
c) \(2^3\cdot17-2^3\cdot14\)
\(=8\cdot17-8\cdot14\)
\(=8\cdot\left(17-14\right)\)
\(=8\cdot3\)
\(=24\)
4.15.17+5.12.27+6.10.56
4.15.17+5.12.27+6.10.56
=(4.15).17+(5.12).27+(6.10).56
=60.17+60.27+60.56
=60.(17+27+56)
=60.100
=6 000
tính nhanh : e) 4.15.17+5.12.27+6.10.56
4 . 15 . 17 + 5 . 12 . 27 + 6 . 10 . 56
= ( 4 . 15 ) . 17 + ( 5 . 12 ) . 27 + ( 6 . 10 ) . 56
= 60 . 17 + 60 . 27 + 60 . 56
= 60 . ( 17 + 27 + 56 )
= 60 . 100
= 6000
4.15.17 + 5.12.27 + 6.10.56
= (4.15).17 + (5.12).27 + (6.10).56
= 60.17 + 60.27 + 60.56
= 60. (17 + 27 + 56)
= 60. 100
= 6000
2.31.12 + 4.42.6 + 8.81 =?
2.31.12+4.42.6+8.81
=(2.12).31+(4.6).42+(8.3).(81:3)
=24.31+24.42+24.27
=24.(31+42+27)
=24.100
=2 400
2.Tính
a){6000:[219-(25-6)]}:15-2
b)407-{[(180-160):4+9]:2}
c)4.15.17+5.12.27+6.10.56
easy
a) {6000 :[219-(25-6)]}: 15 -2
{6000 : [ 219- 19]} : 15 -2
{6000 :200 } : 15 -2
30 : 15 -2
2-2=0
b) 407-{[(180-160):4+9]:2}
407-{[20:4+9]:2}
407-{14:2}
407-7=400
c)4.15.17+5.12.27+6.10.56
1020+1620+3360
=6000
nhớ k mình nha
a.(6000:200):15-2
30-15-2=0
b.407-[(5+9):2]
407-7
400
c.60*17+60*27+60*56
60*(17+27+56)
6000
a){6000:[219-(25-6)]}:15-2
=(6000:200):15-2
=30:15-2
=2-2
=0
17.85+15.17+23.3.5
\(17\cdot85+15\cdot17+2^3\cdot3\cdot5\)
\(=17\cdot100+40\cdot3\)
\(=1700+120=1820\)