Question

Bài 1: Tính nhanh

A, 1968 x 15 + 1968 x 84 + 1968

B, 6412 + 5378 + 3582 + 4628

C, 178 x 101 - 178

D, 153 x 8 + 153 + 153

Answer 1

a: \(1968\cdot15+1968\cdot84+1968\)

\(=1968\left(15+84+1\right)\)

\(=1968\cdot100=196800\)

b: \(6412+5378+3582+4628\)

\(=\left(6412+4628\right)+\left(5378+3582\right)\)

\(=11040+8960=20000\)

c: \(178\cdot101-178\)

\(=178\cdot101-178\cdot1\)

\(=178\left(101-1\right)=178\cdot100=17800\)

d: \(153\cdot8+153+153\)

\(=153\left(8+1+1\right)\)

\(=153\cdot10=1530\)