bonsoir
ex 1
1) A=2a-4×(c-5b)
2×6-4×(-12-5×-3)
12-4×(-12+15)
12+48-60
0
B=-3-1/3÷3+-2/3×9/4
-3-1/3=-9/3-1/3=-10/3
3+-2/3×9/4=3-18/12=36/12-18/12=18/12
-10/3×12/18=-120/54=(-120÷6)/(54÷6)=-20/9
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bonsoir
ex 1
1) A=2a-4×(c-5b)
2×6-4×(-12-5×-3)
12-4×(-12+15)
12+48-60
0
B=-3-1/3÷3+-2/3×9/4
-3-1/3=-9/3-1/3=-10/3
3+-2/3×9/4=3-18/12=36/12-18/12=18/12
-10/3×12/18=-120/54=(-120÷6)/(54÷6)=-20/9