(145 x 99 + 145) - (143 x 102 - 143)

=(145 x (99+1) - (143 x (102-1)

=(145 x 100) - (143 x 101)

=14500 - 14443

=57

Chúc bạn học tốt .

Đề:.............

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

= 145 x 100 - 143 x 100

= 14500 - 14300

= 2

(145x99+145)-(143x101-143)

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

=145x100-143x100

=14500-14300=200

\(=145\cdot100-143\cdot100=200\)

Có nè Diệp

(145x99+145)-(143x101-143)

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

=145x100-143x100

=14500-14300

=200

lf chưa xong à. Tớ xong lâu rồi. Cho tớ 1 like nhé bn 

(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27

= 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)

= 145 × 100 – 143 × 100 + 47 × 1 – 47

= 100 × (145 – 143) + (47 – 47)

= 100 × 2 + 0

= 200

(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27

= 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)

= 145 × 100 – 143 × 100 + 47 × 1 – 47

= 100 × (145 – 143) + (47 – 47)

= 100 × 2 + 0

= 200

giỏi

(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27

= 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)

= 145 × 100 – 143 × 100 + 47 × 1 – 47

= 100 × (145 – 143) + (47 – 47)

= 100 × 2 + 0

= 200

= 145 x (99+1) - 143 x ( 102-2) + 47 x ( 54 - 53) -20-27

= 145 x 100 - 143 x 100 + 47 x 1 -20-27

= 100 x ( 145 - 143 ) + 47 - 20 - 27

= 200 + 47 - 20 - 27

= 200

Ghi từng cái thôi ! Ghi nhiều thế làm mỏi cả tay !!!

cậu chả lời mỗi câu a và câu b thôi

b: =47-47=0

A) 145 x (99 + 1) - 143 x (102 - 1)

= 145 x 100 - 143 x 101 = 145 x 100 - 143 x (100 + 1)

= 100 x (145 - 143)  - 143

= 200 - 143 = 57

B) 54 x 47 - 47 x 53 - 20 - 27

= 47 x (54 - 53) - (20 + 27)

= 47 x 1 - 47 = 0