Question

Calculeaza in doua modified:
Ex 3 dp foaie vrg

Answer 1

a) (30+2) ×11=

1. 32×11=352

2. 30×11+2×11=330+22=352

b) 2×(14-4)=

1. 2×10=20

2. 2×14-(2×4)=28-8=20

c) (281+9) ×17=

1. 290×17=4930

2. 281×17+9×17= 4777+153=4930

d) 5×(28-8)=

1. 5×20=100

2. 5×28-(5×8)=140-40=100

e) 14×(320-120)=

1. 14×200=2800

2. 14×320-(14×120)=4480-1680=2800

f) (16+4)×10=

1. 20×10=200

2. 16×10+4×10=160+40=200

g) 43×(420-310)=

1. 43×110=4730

2. 43×420-(43×310)=18060-13330=4730

h) (2015-1015) ×9=

1. 1000×9=9000

2. 2015×9-(1015×9)=18135-9135=9000