Tính nhanh
136 . 36 + 18 . 272
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\(272+\left(146+x\right)=118\)
\(272+146+x=118\)
\(418+x=118\)
\(x=118-418\)
\(x=-300\)
13 + 21.5 - (198 : 11 - 8)
= 13 + 105 - 10
= 108
272 : 16 - 5 +4 (30 - 5 - 255 : 17)
= 17 - 5 + 4. ( 30 - 5 - 15 )
= 16 . 10
= 160
15.24 - 14.5 (145 : 5 - 27)
= 360 - 70 ( 29 - 27 )
= 290 . 2
= 580
18.3 - 18.2 + 3 (51 : 17)
= 54 - 36 + 3 . 3
= 54 - 36 + 9
= 27
(64 + 115 + 36) - 25.8
= 215 - 200
= 15
15.8 - (17 - 30 + 83) - 144 : 6
= 120 - 70 - 24
= 26
250 : 50 - (46 - 75 + 54) : 5
= 5 - 25 : 5
= 5 - 5
= 0
13 (17 - 95 + 83) : 5 - 18 : 9
= 13. 5 : 5 - 2
= 65 : 5 - 2
= 13 - 2
= 11
140 - 180(47 - 90 + 43) + 7
= 140 - 180 . 0 + 7
= 140 + 7
= 147
24 (15 + 30 + 85 - 120):10
= 24. 10 : 10
= 240 : 10
= 24
27 + 73 - 30 : (25 -10)
= 27 + 73 - 30 : 15
= 27 + 73 - 2
= 98
18 - 4 (27 - 90 + 73) : 10
= 18 - 4. 10 : 10
= 18 - 40 : 10
= 18 - 4
= 14
Bài 2: Tính
140 - [ 25 : (4 mũ 2 - 11) + 4 ]
= 140 - [25 : (16 - 11) + 4 ]
= 140 - [ 25 : 5 + 4 ]
= 140 - [ 5 + 4]
= 140 - 9
= 131
Đáp án là:
a) 36*333-108*111
= 36*3*111-108*111
=108*111-108*111
=0
b) 136*68+16*272
=136*68+16*2*136
=136*68+32*136
=136*(68+32)
=136*100
=13600
a) 36*333 - 108*111
= 36*3*111 - 108*111
= 108*111 - 108*111
= 0
b) 136*68 + 16*272
= 136*68 + 16*2*136
= 136*68 + 32*136
= 136*(68 + 32)
= 136*100
= 13600
2:
a: \(2^2\cdot3-4=4\cdot3-4=12-4=8\)
b: \(16-2^3\cdot2=16-2^4=16-16=0\)
c: \(4^2-4\cdot2=16-8=8\)
d: \(3^3-2\cdot3^2=27-2\cdot9=27-18=9\)
e: \(7^2-9\cdot2^2=49-9\cdot4=49-36=13\)
f: \(2^2\cdot3+4^2=4\cdot3+16=12+16=28\)
Bài 1:
a: \(13+21\cdot5-\left(198:11-8\right)\)
\(=13+105-18+8\)
=21+87
=108
b: \(272:16-5+4\cdot\left(30-5-255:17\right)\)
\(=17-5+4\cdot\left(30-5-15\right)\)
\(=12+4\cdot10=12+40=52\)
c: \(15\cdot24-14\cdot5\cdot\left(145:5-27\right)\)
\(=360-70\left(29-27\right)\)
=360-140
=220
d: \(18\cdot3-18\cdot2+3\cdot\left(\dfrac{51}{17}\right)\)
\(=18\left(3-2\right)+3\cdot3\)
=18+9
=27
e: \(64+115+36-25\cdot8\cdot6\cdot2^2\cdot3+4^2\)
\(=100+115-200\cdot6\cdot4\cdot3+16\)
\(=231-14400=-14169\)
f: \(15\cdot8-\left(17-30+83\right)-144:6\)
\(=120-24-\left(100-30\right)\)
=96-70
=26
a) 136 x 68 + 16 x 272 = 136 x 68 + 16 x 2 x 136 = 136 x 68 + 32 x 136 = 136 x ( 68 + 32 ) = 136 x 100 = 13600
b) 8 x 9 x14 + 6 x 17 x 12 + 19 x 4 x18 = 2 x 4 x9 x 14 + 6 x 17 x 4 x 3 + 19 x 4 x 18
= 56 x 18 + 18 x 68 + 76 x 18 = 18 x ( 56 + 68 + 76 ) = 18 x 200 = 3600
1)
a) \(34,2:36=0,95\)
b) \(36,18:18=2,01\)
c) \(5,05:25=0,202\)
d) \(17,25:75=0,23\)
2)
a) \(75,52:32=2,36\)
b) \(4,68:13=0,36\)
c) \(81,6:34=2,4\)
d) \(134,4:42=3,2\)
3)
a) \(882:36=24,5\)
b) \(78:24=3,25\)
c) \(3:15=0,2\)
d) \(15:75=0,2\)
4)
a) \(3:75=0,04\)
b) \(750:300=2,5\)
c) \(390:12=32,5\)
d) \(54:24=2,25\)
18 : 9 = 2
27 : 9 = 3
36 : 9 = 4
45 : 9 = 5
18 : 2 = 9
27 : 3 = 9
36 : 4 = 9
45 : 5 = 9
18*24+18*128-36-36*5-20*9
=18*24+18*128-18*2-18*2*5-2*10*9
=18*24+18*128-18*2-18*10-18*10
=18*(24+128-2-10-10)
=18*130
=2340
\(\left(-75\right)\left(18-65\right)-65\left(75-18\right)\)
\(=\left(-75\right).18-\left(-75\right).65-65.75+65.18\)
\(=\left(-75\right).18+75.65-65.75+65.18\)
\(=18.\left[\left(-75\right)+65\right]+\left(75.65-65.75\right)\)
\(=18.\left(-10\right)=-180\)
P/s: Hoq chắc
136 . 36 + 18 . 272
= 272.18 + 18.272
= 272.(18 + 18)
= 272 x 36
= 9792
\(136.36+18.272\)
\(=136.36+18.2.136\)
\(=136.36+36.136\)
\(=136.\left(36+36\right)\)
\(=136.72\)
\(=9792\)
Lớp 5 mà đã dùng dấu . là nhân sao