Factoriser,puis calculer 2X0,784+8X0,784= 1,3X80+2,7X80= 153X2,7-2,7X53= 2,3X5-1,8X5

bonjour,



2X0,784+8X0,784=  0,784(2+8) = 0,784*10 = 7,84

1,3X80+2,7X80=  80(1,3+2,7) = 80*4 = 320

 153X2,7-2,7X53= 2,7(153-53) = 2,7*100 = 270

 2,3X5-1,8X5 = 5(2,3-1,8) = 5*0,5 = 2,5

bonjour

2X0,784+8X0,784=
0.784x  ( 2 + 8 )  = 0.784 x 10  = 7.84

 1,3X80+2,7X80=  80 x ( 1.3 + 2.7) = 80 x 4 = 320

153X2,7-2,7X53= 2.7 x ( 153 - 53) = 2.7 x 100= 270

 2,3X5-1,8X5 = 5 ( 2.3 - 1.8) = 5 x 0.5 = 2.5