145/2014 x 35/54 + 145/2014x 19/54

= 145/2014 x ( 35/54 + 19/54 )

= 145/2014 x 1

= 145/2014

Chúc Bn hok tốt :3

thak bạn nhiều nha

\(a.145\times565+145\times54+56\times145\)

\(=145\times\left(565+54+56\right)\)

\(=145\times675\)

\(=97875\)

\(b.225\times104\)

\(=\left(100+4\right)\times225\)

\(=22500+900\)

\(=23400\)

\(c.1000:\left(20\times25\right)\)

\(=1000:500\)

\(=2\)

\(d.\left(206\times20\right):2\)

\(=206\times\left(20:2\right)\)

\(=206\times10=2060\)

a) 325 x 145 + 145 x 475 + 145 + 145 x 199 = 145 x (325+475 + 1 +199)

= 145 x 1000 = 145000

(89 x 12-2 x 6 x 89) + (145 x 54 + 146 x 45+ 100)
= ( 1068 - 1068) + ( 7830 + 6570 + 100)

= 0 + 7830 + 6570 + 100

= 14400 + 100

= 14500

0+14500=14500

a ) \(=\frac{35\cdot42}{5\cdot2}=\frac{7\cdot5\cdot2\cdot21}{5\cdot2}\)

\(=\frac{7\cdot21}{1}=147\)

b) \(=\frac{54\cdot35}{7\cdot9}\)

\(=\frac{6\cdot9\cdot7\cdot5}{7\cdot9}\)

\(=\frac{6\cdot5}{1}=30\)

35x42/5x2= 5x7x2x12/5x2=84

54x35/7x9=6x9x7x5/7x9=30

(36 + 54) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7

= (90 + 9 + 1 ) x 7

= 100 x 7

= 700

(36 + 54) x 7 + 7 x 9 + 7

= 90 x 7 + 7 x 9 + 7

= (90 + 9 + 1 ) x 7

= 100 x 7

= 700