40,36 × 2 + 20,18 × 3+ 10,09 × 8 – 20,19

Đáp án:

$=201,79$

Giải thích các bước giải:

$40,36 × 2 + 20,18 × 3+ 10,09 × 8 – 20,19$

$=40,36 × 2 + 20,18 × (2+1)+ 10,09 × 4×2 – 20,19$

$=40,36 × 2 + 20,18 × 2+20,18+ 40,36×2 – 20,19$

$=40,36 × 2 + 20,18 × 2+ 40,36×2 – 20,19+20,18$

$=40,36 × 2 + 40,36×1+ 40,36×2 – 20,19+20,18$

$=40,36 × 2 + 40,36×1+ 40,36×2 – (20,19-20,18)$

$=40,36 × 2 + 40,36×1+ 40,36×2 – 0,01$

$=40,36 × (2 + 1+ 2) – 0,01$

$=40,36 × 5 – 0,01$

$=201,8- 0,01$

$=201,79$