Question

tinh nhanh

a,13x58x4+32x26x2+52x10

b,15x37x4+120x21+21x5x12

Answer 1

13.58.4 + 32.26.2 + 52.10

= 13.4.58 + 32.26.2 + 52.10

= 52.58 + 32.52 + 52.10

= 52.(58+32+10)

= 52.100

= 5200

Answer 2

binh thuong

Answer 3

a, 13.58.4+32.26.2+52.10

=52.58+52.32+52.10

=52(58+32+10)=52.100=5200

b, 15.37.4+120.21+21.5.12

=60.37+120.21+60.21

=60(37+2.21+21)=60.100=6000