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) \(...=0:31,792=0\)
c) \(\left(7,91+5,09-6,05-6,95\right):31,792\)
\(=0:31,792=0\)
d) \(...=\dfrac{16,2x\left(5,7+3,7\right)-6,2x\left(4,8+4,6\right)}{36,9-34,9}\)
\(=\dfrac{16,2x9,4-6,2x9,4}{2}\)
\(=\dfrac{9,4x\left(16,2-6,2\right)}{2}\)
\(=\dfrac{9,4x10}{2}=9,4x5=47\)
Bài 1
\(a,18,5:4,6+14,8:4,6+12,7:4,6\)
\(=18,5\times\dfrac{1}{4,6}+14,8\times\dfrac{1}{4,6}+12,7\times\dfrac{1}{4,6}\)
\(=\dfrac{1}{4,6}\times\left(18,5+14,8+12,7\right)\)
\(=\dfrac{1}{4,6}\times46\)
\(=10\)
\(b,0,75\times1,3+0,25\times1,3\)
\(=1,3\times\left(0,75+0,25\right)\)
\(=1,3\times1\)
\(=1,3\)
\(c,\left(7,91+5,09-6,05-6,95\right):31,792\)
\(=\left(13-13\right):31,792\)
\(=0:31,792\)
\(=0\)
\(d,\dfrac{5,7.16,2+16,2.3,7-6,2.4,8-6,2.4,6}{13,4+12,3+11,2-10,4-11,5-12,6-0,4}\)
\(=\dfrac{16,2\left(5,7+3,7\right)-6,2\left(4,8+4,6\right)}{2}\)
\(=\dfrac{16,2.9,4-6,2.9,4}{2}\)
\(=\dfrac{9,4\left(16,2-6,2\right)}{2}\)
\(=\dfrac{94}{2}=47\)
