Question

tính nhanh: 12,3x4,7+5,3x12,3-1,4x7,5+7,5x5,4

Answer 1

\(12,3\times4,7+5,3\times12,3-1,4\times7,5+7,5\times5,4=12,3\times\left(4,7+5,3\right)+7,5\times\left(5,4-1,4\right)=12,3\times10+7,5\times4=123+30=153\)

Answer 2

12,3×4,7+5,3×12,3−1,4×7,5+7,5×5,4=12,3×(4,7+5,3)+7,5×(5,4−1,4)=12,3×10+7,5×4=123+30=153