Question

Bài 1:tính hợp lý.

a) 1+2+66-55-22+200+5555

b)30+40+90+22-20

Answer 1

Bài 1:tính hợp lý.

a) 1+2+66-55-22+200+5555

=3+66-55-22+200+5555

=69-55-22+200+5555

=14-22+200+5555

=(200-22)+14+5555

=178+14+5555

=192+5555

=5747

b)30+40+90+22-20

=(30+22)+(40-20)+90

=52+20+90

=72+90

=162

Answer 2

(5555-55) +(66+1+2-22)

=5500+ 47

=5547

b)  (30+40+90-20)+22

=140-22=118

Answer 3

( 5555 - 55 ) + ( 66 + 1 + 2 - 22 )

= 5500 + 47

= 5547

b) ( 30 + 40 + 90 -20 ) + 22

= 140 - 22

= 118

Thấy Đúng thì k cho mình nha