Tính nhanh : 30 × 25 × 7 × 8 75× 8 × 12 × 14

2 câu trả lời

Đáp án:

$30$ × $25$ × $7$ × $8$

 =($30$ x $7$)x($25$ x $8$)

= $210$ x $200$

= $42000$

$75$× $8$ × $12$ × $14$

= ( $75$ x $12$ ) x  ( $8$ x $14$ )

= $900$ x $ 112 $

=$100800$

xin CTLHN

30 × 25 × 7 × 8 = ( 30×7).(25×8)

                          = 210×200

                          = 41 000

75× 8 × 12 × 14  = ( 12× 14)×( 75× 8) 

                            =  168  × 600

                            =  100 800