Tính nhanh:
(– 23)x 46 + (-54)x 23
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23 x 45 + 46 x 23 + 23 x 8 + 23
= 23 x 45 + 46 x 23 + 23 x 8 + 23 x 1
= 23 x (45 + 46 + 8 + 1)
= 23 x 100
= 2300
\(\frac{12.23+23.88}{46.3+46.14}\)
\(=\frac{23.\left(12+88\right)}{46.\left(3+14\right)}\)
\(=\frac{23.100}{46.17}\)
\(=\frac{23.2.50}{23.2.17}\)
\(=\frac{50}{17}\)
\(\frac{12x23+23x88}{46x3+46x14}\)
=\(\frac{23x\left(12+88\right)}{46x\left(14+3\right)}\)
=\(\frac{23x100}{46x17}\)
= \(\frac{50}{17}\)
`23/34 xx 17/15 xx5/46`
`= 23/30 xx 5/46`
`= 1/12`
\(\dfrac{23}{34}x\dfrac{17}{15}x\dfrac{5}{46}=\dfrac{23x17x5}{34x15x46}=\dfrac{1}{12}\)
Bài 1
a) 76 x 54 + 2 x 27 x 23 + 54 = 76 x 54 + 54 x 23 + 54 = 54 x (76 + 23 + 1) = 54 x 100 = 5400
b) 17 x 82 - 17 x 32 = 17 x (82 - 32) = 17 x 50 = 850
Bài 2
28 - (x + 3) = 14
x + 3 = 28 - 14
x + 3 = 14
x = 14 - 3
x = 11
\(23.157+46.15-23.87\)
\(=23.157+23.30-23.87\)
\(=23\left(157+30-87\right)\)
\(=23.100\)
\(=2300\)
Hok tot
23 x 157 + 46 x 15 - 23 x 87
= 23 x 157 + 23 x 30 - 23 x 87
= 23 x ( 157 + 30 - 87 )
= 23 x 100
= 2300
[54.(46+49)]-[46.(54-49)]
=[54.46+54.49]-[54.46-46.49]
=54.46+54.49-54.46+46.49
=54.46-54.46+54.49+46.49
=54.49+46.49
=49.(54+46)
=49.100
=4900
Chúc bn học tốt
\(54\times\left(46+49\right)-46\times\left(54-49\right)\)
\(=54\times46+54\times49-46\times54+46\times49\)
\(=\left(54\times46-46\times54\right)+49\times\left(54+46\right)\)
\(=49\times100\)
\(=4900\)
36 . 23 + 62 . 23 + 46
= 23 (36 + 62) + 46
= 23 . 98 + 48
= 20 . 90 + 3 . 8 + 48
= 180 + 24 + 48
= 180 +(24 + 48)
= 180 + 72
= 252
\(36\cdot23\cdot62\cdot23+46\)
\(=36\cdot23+62\cdot23+23\cdot2\)
\(=23\left(36+62+2\right)\)
\(23\cdot100=2300\)
(-23) . 46 + (-54) . 23
= 23 . (-46) + (-54) . 23
= 23 . [(-46) + (-54)]
= 23 . (-100)
= -2300
___HT___