Tính nhanh:
33 x 76 + 34 x 24
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b) 35 x 24 + 35 x 76 +55 x 19 +55 x 91
= 35 x ( 24 + 76 ) + 55 x ( 19 + 91 )
= 35 x100 +55 x 100
= 100 x ( 55 + 35 )
= 90 x 100 =9 000
c) \(6\cdot25\cdot4+4\cdot19\cdot6-2\cdot14\cdot12\)
\(=24\cdot25+24\cdot19-24\cdot14\)
\(=24\left(25+19-14\right)\)
\(=24\cdot30=720\)
d) \(19\cdot64+76\cdot34\)
\(=76\cdot19+76\cdot34\)
\(=76\left(19+34\right)=76\cdot53=4028\)
a) 2 x 16 x 50 x 25
= ( 2 x 50 ) x ( 16 x 25 )
= 100 x 400
= 40 000
\(19\cdot64+76\cdot34\)
\(=19\cdot64+19\cdot4\cdot34\)
\(=19\cdot64+19\cdot136\)
\(=19\cdot\left(64+136\right)\)
\(=19\cdot200\)
\(=3800\)
19 x 64 + 76 x 34
= 38 x 32 + 38 x 68
= 38 x ( 32 + 68)
= 38 x 100
= 3800
\(24.17+52.76+24.35\)
\(=24.\left(17+35\right)+52.76\)
\(=24.52+52.76\)
\(=52.\left(76+24\right)\)
\(=52.100\)
\(=5200\)
24 x 17 + 52 x 76 + 24 x 35
= 24 x ( 17 + 35 ) + 52 x 76
= 24 x 52 + 52 x 76
= 52 x ( 24 + 76 )
= 52 x 100
= 5200
~~~~~~~~~~Hok tốt~~~~~~~~~~
80*33+97*33+34*97+33*17
=33*(80+97+17)+34*97
=33*194+34*97
=33*97*2+34*97
=97*(33*2+34)
=97*100
=9700
tik mik nha bn
1a) -54 . 76 + 12 .(-76) + 76.(-34)
= (-54 - 12 - 34).76
= -100 . 76
= -176
b) 37.(63 - 24) - 63.(24 + 37)
= 37 . 63 - 37 . 24 - 63.24 - 63 . 37
= (37.63 - 63.37) - (37 + 63) . 24
= 0 - 100 . 24
= - 2400
2a) x + (-27) = -23 - x
=> x + x = -23 + 27
=> 2x = 4
=> x = 4 : 2
=> x = 2
b) xy + 2x - y = 15
=> x(y + 2) - y = 15
=> x(y + 2) - (y + 2) = 13
=> (x - 1)(y + 2) = 13 = 1 . 13 = 13 . 1
Lập bảng :
x - 1 | 1 | -1 | 13 | -13 |
y + 2 | 13 | -13 | 1 | -1 |
x | 2 | 0 | 14 | -12 |
y | 11 | -15 | -1 | -3 |
Vậy ...
24 x 34 + 24 x 34 + 24 x 37
=24 x ( 34 + 34 + 37 )
= 24 x 100
= 2400
\(24\cdot76+48\cdot12-20\cdot100=24\cdot76+24\cdot2\cdot12-20\cdot100\)
\(=24\cdot\left(76+2+12\right)-20\cdot100\)
\(=24\cdot100-20\cdot100\)
\(=\left(24-20\right)\cdot100\)
\(=4\cdot100=400\)
35 x 146 - 7 x 46 x 5 24 x 35 + 35 x 76
= 35 x 146 - 7 x 5 x 46 = 35 x ( 24 + 76 )
= 35 x 146 - 35 x 46 = 35 x 100
= 35 x ( 146 - 46 ) = 3500
= 35 x 100
= 3500
= 35 x ( 146 - 46) / 35 x ( 24 + 76)
= 35 x 100 / 35 x 100
= 1
a) 19 x 64 + 76 x 34 = 19 x 64 + 19 x 4 x 34 = 19 x (64 + 4 x 34) = 19 x 200 = 3800
b) 35 x 12 + 65 x 13 = 35 x 12 + 65 x 12 + 65 = 12 x (35 + 65) + 65 = 12 x 100 + 65 = 1265
c) 136 x 68 + 16 x 272 = 136 x 68 + 16 x 2 x 136 = 136 x (68 + 16 x 2) = 136 x 100 = 13600
`33 . 76 + 34 . 24`
`= 33 . 76 + (33 + 1) . 24`
`= 33 . 76 + 33 . 24 + 1 . 24`
`=33 . (76 + 24) + 24`
`= 33 . 100 + 24`
`= 3300 + 24`
`= 3324`
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