= \(\frac{145}{2014}\times\left(\frac{35}{54}+\frac{9}{54}\right)=\frac{145}{2014}\times\frac{44}{54}=\frac{145}{1007}\times\frac{11}{27}=\frac{1595}{27189}\)

Bạn còn cách nào giải thích rõ hơn không ?

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

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

\(=145\times675\)

\(=97875\)

\(b.225\times104\)

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

\(=22500+900\)

\(=23400\)

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

\(=1000:500\)

\(=2\)

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

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

\(=206\times10=2060\)

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) Tính bằng cách thuận tiện nhất:

134 x 4 x 5

= 134 x (4 x 5)

= 134 x 20 = 1680

5 x 36 x 2

= 36x (5 x 2)

= 36 x 10 = 360

42 x 2 x 7 x5

= (42 x 7) x (2 x5)

= 294 x 10 = 2940

b) 137 x 3 + 137 x 97

= 137 x (3 + 97)

= 137 x 100 = 13700

94 x 12 + 94 x 88

= 94 x (12 + 88)

= 94 x 100 = 9400

428 x 12 - 428 x 2

= 428 x (12 - 2) = 4280

537 x 39 - 537 x 19

= 537 x (39 - 19)

= 537 x 20 = 10740

145.99+143.101-143+145

=145.(99+1)+143.(101-1)

=145.100+143.100

=100.(145+143)

=100.288

=28800

HT

TL

= 28800

nhaaaaaaa

HT

2850

HT nhé

a) 6*1235*20-5*235*24 = 120(1235-235)=120.1000=120000

b) =[145*99+145*1]-[143101*1]=145*[99+1]-145*[101-1]=145*100-143*100=100*[145-143]=100*2=200