Sagot :
A = 8/7 -1/7 = 7/7 7/7 X 4/3 = 28/21 = 4/3
3/4 3/4
B = 13,4 X 10 P5 X2X10 P -7
B = 13,4 X 2 X 10 P 5-7
B = 26,8 X 10 P -2
C =+ 7 X (-3) -(-5+9) X (-4-3)
-21 - (+4) (-7)
-21 +28
+7
A = 8/7 -1/7 : 3/4
tu commences par la division
A = 8/7 -1/7 x 4/3
A = 8/7 - 4/21
A =24/21 -4/21 = 20/21
B = 13.4x 10^5 x 2 x10^-7
B = 1340000 x 0.0000002 = 0.268 = 2.68 x 10^-1
C = 7 x (-3) - (- 5+9) x (-4-3)
C = -21 - 4 x -7
C = -21 +28 = 7