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a) \(18,5:4,6+14,8:4,6+12,7:4,6\)
\(=\left(18,5+14,8+12,7\right):4,6\)
\(=46:4,6=10\)
b) \(0,75.1,3+0,25.1,3\)
\(=\left(0,75+0,25\right).1,3\)
\(=1.1,3=\dfrac{13}{10}\)
a) \(18,5:4,6+14,8:4,6+12,7:4,6\)
\(=\dfrac{18,5}{4,6}+\dfrac{14,8}{4,6}+\dfrac{12,7}{4,6}\)
\(=\dfrac{1}{4,6}.\left(18,5+14,8+12,7\right)\)
\(=\dfrac{1}{4,6}.46=10\)
b) \(...=1,3.\left(0,75+0,25\right)=1,3.1=1,3\)
c) \(...=0:31,792=0\)
tính nhanh : 16, 2 x 3,7 +5,7 x 16,2 - 7,8 x 4,8 - 4,6 x 7,8 / 11,2 + 12,3 +13,4 - 12,6 - 11,5- 10,4
\(=\dfrac{16.2\cdot9.4-7.8\cdot9.4}{2,4}=\dfrac{8.4\cdot9,4}{2,4}=32.9\)
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\(a)16,2.3,7+16,2.5,7-7,8.4,8-4,6.7,8\)
\(=16,2\left(3,7+5,7\right)-7,8\left(4,8-4,6\right)\)
\(=16,2.9,4-7,8.0,2\)
\(=152,28-1,56=150,72\)
\(b)11,2+12,3+13,4-12,6-11,5-10,4\)
\(=23,5+13,4-10,4-12,6-11,5\)
\(=23,5-11,5-23+13,4\)
\(=12-23+13,4=-11+13,4=2,4\)
a: 891+(359+109)
=891+109+359
=1000+359=1359
b: \(\dfrac{19}{11}+\left(\dfrac{5}{13}+\dfrac{3}{11}\right)\)
\(=\dfrac{19}{11}+\dfrac{3}{11}+\dfrac{5}{13}\)
\(=2+\dfrac{5}{13}=\dfrac{31}{13}\)
c: \(\dfrac{17,8\cdot3,7-7,8\cdot4,8+5,7\cdot17,8-4,6\cdot7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)
\(=\dfrac{17,8\left(3,7+5,7\right)-7,8\left(4,8+4,6\right)}{11,2-10,4+12,3-11,5+13,4-12,6}\)
\(=\dfrac{17,8\cdot9,4-7,8\cdot9,4}{0,8+0,8+0,8}=\dfrac{9,4\cdot10}{2,4}=\dfrac{94}{2,4}=\dfrac{940}{24}=\dfrac{235}{6}\)
\(a,891+\left(359+109\right)\\ =\left(891+109\right)+359\\ =1000+359\\ =1359\\ b,\dfrac{19}{11}+\left(\dfrac{5}{13}+\dfrac{3}{11}\right)\\ =\left(\dfrac{19}{11}+\dfrac{3}{11}\right)+\dfrac{5}{13}\\ =2+\dfrac{5}{13}\\ =\dfrac{26}{13}+\dfrac{5}{13}\\ =\dfrac{31}{13}\\ c,\dfrac{17,8\times3,7-7,8\times4,8+5,7\cdot17,8-4,6\times7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\\ =\dfrac{17,8\times\left(3,7+5,7\right)-7,8\times\left(4,8+4,6\right)}{\left(11,2+12,3-11,5\right)+\left(13,4-10,4\right)-12,6}\\ =\dfrac{17,8\times9,4-7,8\times9,4}{12+3-12,6}\\ =\dfrac{9,4\times\left(17,8-7,8\right)}{2,4}\\ =\dfrac{94}{2,4}\\ =\dfrac{940}{24}=\dfrac{235}{6}\)