hitunglah bentuk bentuk oprasi berikut! a.7×(5-3)+1= b.3+8-5×4= c.10×3÷6-2= d.28÷(1-5)+81= e.6+5×4-3÷1-2=

a. 7 x 2 + 1 = 14 + 1
                   = 15
b. 3 + 8 - 20 = 11 - 20
                    = -9
c. 30 : 6 - 2 = 5 - 2
                   = 3
d. 28 : -4 + 81 = -7 + 81
                       = 74
e. 6 + 20 - 3 - 2 = 26 - 5
                          = 21

a.7×(5-3)+1 = 7×2+1 = 14+1 = 15
b.3+8-5×4 = 3+8-20 = 11-20 =-9
c.10×3÷6-2 = 30÷6-2 = 5-2 = 3
d.28÷(1-5)+81 = 28÷(-4)+81 = -7+81 = 74
e.6+5×4-3÷1-2 = 6+20-3÷1-2
= 6+20-3-2
= 26-3-2
= 23 - 2
= 21