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Sagot :
Answer:
21C
22D
23B
24C
25A
Step-by-step explanation:
Answer:
21) c)29
22) d)57
23) b)-321
24) c)70
25) a)-10
explanation
let the unknown answer be x
21) x+(-9)=20
x-9=20
x=20+9
x=29
22)45-(-12)=x
45+12= 57
23)x×123 = -39483
x= -39483
123
x= -321
24) (30×3)+(-2×10)
90+(-20)
90-20=70
25) 5×-2=-10
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