Question

d) 43 . 78 – 43 . 48 + 30 .80 – 30 . 23 tính nhanh nha nhớ trình bày hẳn ra

Answer 1

\(d)\)\(43.78-43.48+30.80-30.23\)

\(=\)\(43.\left(78-48\right)+30.\left(80-23\right)\)

\(=\)\(43.30+30.57\)

\(=\)\(30.\left(43+57\right)\)

\(=\)\(30.100\)

\(=\)\(3000\)

Answer 2

\(43\times78-43\times48+30\times80-30\times23\)

\(=43\left(78-48\right)+30\times80-30\times23\)

\(=43\times30+30\times80-30\times23\)

\(=30\left(43+80-23\right)=30.100=3000\)

Answer 3

D)43.78-43.48+30.80-30.23

=43.(78-48)+30.(80-23)

=43.30+30.57

=30.(43+57)

=30.100

=3000