Question

Tính nhanh

a) 8, 3 x 5,7 + 8,3 x 4,3

b) 142,7 x 0,75 - 42,7 x 0,75

c) 6,8 x 0,35 +0,35 x 3,2

d) 8,62 x 3,2 x 4 - 7,62 x 12,8

Answer 1

a: =8,3(5,7+4,3)=8,3*10=83

b: =0,75(142,7-42,7)=0,75*100=75

c: =0,35(6,8+3,2)=0,35*10=3,5

d: =12.8(8,62-7,62)=12,8

Answer 2

\(a,8,3\times5,7+8,3\times4,3\\ =8,3\times\left(5,7+4,3\right)\\ =8,3\times10\\ =83\\ b,142,7\times0,75-42,7\times0,75\\ =\left(142,7-42,7\right)\times0,75\\ =100\times0,75\\ =75\\ c,6,8\times0,35+0,35\times3,2\\ =\left(6,8+3,2\right)\times0,35\\ =10\times0,35\\ =3,5\\ d,8,62\times3,2\times4-7,62\times12,8\\ =8,62\times12,8-7,62\times12,8\\ =\left(8,62-7,62\right)\times12,8\\ =1\times12,8\\ =12,8\)

Answer 3

a: =8,3(5,7+4,3)=8,3*10=83

b: =0,75(142,7-42,7)=0,75*100=75

c: =0,35(6,8+3,2)=0,35*10=3,5

d: =12.8(8,62-7,62)=12,8