tính nhanh: 64 x 50 + 44 x 100 phần 27 x 38 + 146 x 19 .
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a. 64 x 50 + 44 x 100
= 32 x 2 x 50 + 44 x 100
= 32 x 100 + 44 x 100
= (32 + 44) x 100
= 76 x 100
= 7600
b. 27 x 38 + 146 x 19
= 27 x 38 + 73 x 19 x 2
= 27 x 38 + 73 x 38
= (27 + 73) x 38
= 100 x 38
= 3800
a/b = 7600/3800 = 2
\(64\times50+44\times100\)
\(=32\times2\times50+44\times100\)
\(=\left(32+44\right)\times100\)
\(=76\times100=7600\)
\(\frac{64\cdot50+44\cdot100}{27\cdot38+146\cdot19}\)
\(\frac{32\cdot100+44\cdot100}{27\cdot38+73\cdot38}\)
\(\frac{\left(32+44\right)\cdot100}{\left(27+73\right)\cdot38}\)
\(\frac{56\cdot100}{100.38}\)
\(\frac{56}{38}\)
\(\frac{28}{19}\)
k mình nha
a) \(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637+526+448}{526\times637+448}\)
\(=1\)
b) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)
\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)
\(=\frac{50\times152}{19\times200}\)
\(=\frac{152}{19\times4}\)
\(=\frac{38}{19}\)
\(=\frac{2}{1}\)
\(=2\)
\(\frac{64X50+44X100}{27X38+146X19}=\frac{64X50+44X2X50}{27X2X38+146X19}=\frac{64X50+88X100}{54X38+146X19}=\frac{50X\left(64+88\right)}{19X\left(54+146\right)}=\frac{50X152}{19X200}\)\(=\frac{̸5̸̸0X152}{19X4X̸5̸0}=\frac{152}{76}=2\) Đáp số :2
\(A=\left(100\times44+50\times60\right)\times\left(37414,8:1000+2242,52:100\right)\)
\(A=\left(4400+3000\right)\times\left(3741,48\times\frac{1}{100}+2242,52\times\frac{1}{100}\right)\)
\(A=7400\times\left[\frac{1}{100}\times\left(3741,48+2242,52\right)\right]\)
\(A=7400\times\frac{1}{100}\times5984\)
\(A=74\times5984\)
\(B=\left(16\times14,96\times25\right)\times\left(27\times38+19\times146\right)\)
\(B=\left(4\times4\times25\times14,96\right)\times\left(27\times19\times2+19\times146\right)\)
\(B=\left(4\times100\times14,96\right)\times\left[19\times\left(54+146\right)\right]\)
\(B=4\times1496\times19\times200\)
\(B=5984\times19\times200\)
Ta có:
\(\frac{A}{B}=\frac{74\times5984}{5984\times19\times200}\)
\(\frac{A}{B}=\frac{37}{19\times100}\)
\(\frac{A}{B}=\frac{37}{1900}\)
Bài hơi dài, nếu có chỗ nào sai sót thì bạn thông cảm nhé
Cho \(A=\left(100\cdot44+50\cdot60\right)\cdot\left(\frac{37414,8}{1000}+2242,\frac{52}{100}\right)\)
\(B=\left(16\cdot14,96\cdot25\right)\cdot\left(27\cdot38+19\cdot146\right)\)
\(A=\left(100\cdot44+50\cdot2\cdot30\right)\cdot\left(3741,48\cdot\frac{1}{100}+2242,52\cdot\frac{1}{100}\right)\)
\(A=\left\{100.\left(44+30\right)\right\}.\left\{\left(3741,48+2242,52\right)\cdot\frac{1}{100}\right\}\)
\(A=7400\cdot5984\cdot\frac{1}{100}\)
\(A=74\cdot5984\)
\(B=\left(16\cdot14,96\cdot25\right)\cdot\left(27\cdot38+19\cdot146\right)\)
\(B=\left(4\cdot4\cdot14,96\cdot25\right)\cdot\left(27\cdot2\cdot19+19\cdot146\right)\)
\(B=100\cdot4\cdot14,96+\left\{19.\left(146+54\right)\right\}\)
\(B=1496\cdot4+19\cdot200\)
\(B=5984\cdot19\cdot200\)
=>\(\frac{A}{B}=\frac{5984\cdot74}{5984\cdot19\cdot200}\)
\(\frac{A}{B}=\frac{74}{19\cdot200}\)
\(\frac{A}{B}=\frac{37}{19\cdot100}\)( Vì giảm 200 : 2 = 100 . Lấy 74 :2 = 37 . Giảm 2 vế đi 2 lần )
=> A : B = 37/1900
Mình đã thử lại đúng nha bạn !
64x100+50x44
=2200+6400
=8600
1026+2774
=3800
mình làm đúng ko vậy
TL:
= 3800
nhé
K CHO MK NHAAAAAAA
BNNNNNNNNNNNNNNNNNNNNNNNNNN
~~HT~~