Question

Tính nhanh a)325.6+6.560+115.6 b)1337:7+154:7+413:7 c)64.25+35.25+25 d)(42.43+43.57+43)-360:4 e)(372-29.4)+(981:9-13)

Answer 1

a: \(=6\left(325+560+115\right)=6\cdot1000=6000\)

b: \(=191+22+69=250+22=272\)

c: \(=25\left(64+35+1\right)=25\cdot1000=25000\)

Answer 2

\(a.325\cdot6+6\cdot560+115\cdot6=6\cdot\left(325+560+115\right)\)

\(=6\cdot1000=6000.\)

\(b.1337:7+154:7+413:7=\left(1337+154+413\right):7\)

\(=1904:7=272.\)

\(c.64\cdot25+35\cdot25+25=64\cdot25+35\cdot25+25\cdot1\)

\(=25\cdot\left(64+35+1\right)=25\cdot100=2500.\)

\(d.\left(42\cdot43+43\cdot57+43\right)-360:4=\left[43\cdot\left(42+57+1\right)\right]-90\)

\(=\left[43\cdot100\right]-90=4300-90=4210.\)

\(e.\left(372-28\cdot4\right)+\left(981:9-13\right)=372-76-109-13\)

\(=174.\)