Question

B1 Tính nhanh nếu có thể(trường hợp ko thể là rất ít nha)

a/128.(278-302)+278.(302-142)

b/(-2).(-6)²+3.(-2)³-62

c/1152-(374=1152)+(-65+374

d/-215.54-430.23

e/(-2)+(-49)+(-18)+49

các bn lm giúp mik nha , thanks

Answer 1

Bài 1:

a) \(128\cdot\left(278-302\right)+278\cdot\left(302-142\right)\)

\(=128\cdot278-128\cdot302+278\cdot302-278\cdot142\)

\(=41408\)

b) \(\left(-2\right)\cdot\left(-6\right)^2+3\cdot\left(-2\right)^3-62\)

\(=\left(-2\right)-36-24-62=-2-36-24-62=-124\)

c) \(1152-\left(374+1152\right)+\left(-65+374\right)\)

\(=1152-374-1152-65+374=-65\)

d) \(-215\cdot54-430\cdot23=-215\cdot54-215\cdot46=-215\left(54+46\right)=-215\cdot100=-21500\)

e) \(\left(-2\right)+\left(-49\right)+\left(-18\right)+49=-20\)

Answer 2

a/128.(278-302)+278.(302-142)

=128(-24)+278.160

=-3072+44480

=41408

b/(-2).(-6)²+3.(-2)³-62

=-2.(-36)+3.(-8)-62

=72+(-24)-62

=48-62

=-14

Answer 3

https://i.imgur.com/C6l5d08.jpg

Answer 4

còn cao nhân nào ggiups mik nốt bài 7