Bài 1: Tính nhanh a)40+30+60+70 b)10+80+90+20 c)25*8*4*125
2 câu trả lời
Bài 1 :
a)40+30+60+70
=(40+60)+(30+70)
=100+100
=200
b)10+80+90+20
=(10+90)+(80+20)
=100+100
=200
c)25×8×4×125
=(25×8)×(4×125)
=200×
= 100000
a, 40 + 30 + 60 + 70
= (40 + 60) + (30 + 70)
= 100 + 100
= 200
b, 10 + 80 + 90 + 20
= (10 + 90) + ( 80 + 20)
= 100 + 100
= 200
c, 25 × 8 × 4 × 125
= (25 × 4) × (125 × 8)
= 100 × 1.000
= 100.000
