tính nhanh:
17,58.43+57.17,18
dấu nhân là dấu chấm
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0,25 x 12,44 + 15,89
= \(3,11+15,89\)rút gọn đó nha
= \(19\)nhớ k nha
\(725:25.10-432:18+127=\left(725:25\right).10-\left(432:18\right)+127=29.10-24+127=290-24+127=393\)
\(\frac{2014.150+1000}{151.2014-1014}\)= \(\frac{150+1000}{\left(150+1\right).1014}\)
= \(\frac{1000}{1014}\)= \(\frac{500}{507}\)
nhớ ủng hộ mik nha
\(\frac{27.13-12}{24+37.12}\)
\(=\frac{351-12}{24+444}\)
\(=\frac{113}{156}\)
đặt S=1.2.3+2.3.4+....+47.48.49
4S=1.2.3.(4-0)+2.3.4.(5-1)+...+47.48.49.(50-46)
4S=1.2.3.4-1.2.3+2.3.4.5-1.2.3.4+....+47.48.49.50-46.47.48.49
4S=47.48.49.50-1.2.3
S=(47.48.49.50-1.2.3):4
\(445-52+155+452\\ =\left(445+155\right)+\left(452-52\right)\\ =600+4000\\ =1000\\ 102\cdot55-102\cdot73+51\cdot36\\ =102\cdot\left(55-73\right)+51\cdot36\\ =102\cdot\left(-18\right)+102\cdot18\\ =0\\ 4\cdot5\cdot2\cdot25\cdot5-1000\\ =5000-1000\\ =4000\\ 8782-291\cdot13\\ =4999\\ 254+\left\{38\cdot\left[\left(42-16\right):2\right]\right\}\\ =254+\left[38\cdot\left(26:2\right)\right]\\ =254+\left(38\cdot13\right)\\ =748\\ \left(2791\cdot34+7882:14\right)\cdot0+1510-510:2\\ =1510-255\\ =1255\)
a. \(445-52+155+452=\left(445+155\right)+\left(452-52\right)=600+400=1000\)
b. \(102\cdot55-102\cdot73+51\cdot36=102\left(55-73+18\right)=102\cdot0=0\)
c.\(4\cdot5\cdot2\cdot25\cdot5-1000=4\cdot25\cdot5\cdot5\cdot2-1000=100\cdot50-1000=5000-1000=4000\)
d. \(8782-291\cdot13=8782-3783=4999\)
e. \(254+\left\{38\left[\left(42-16\right)\div2\right]\right\}=254+\left\{30\cdot13\right\}=254+494=748\)
f. \(\left(2791\cdot34+7882\div14\right)\cdot0+1510-510\div2=0+1510-255=1255\)\
17,58 x 43 + 57 x 17,58
= 17,58 x ( 43 + 57 )
= 17,58 x 100
= 1758