Question

ma poate ajuta cineva cu tema îi dou coronita

Answer 1

1)a)125 pagini=9+90x2+26x3=9+180+78=267 cifre
b)(522-9-180)÷3=333÷3=111
111+90+9=210 pagini

2)a)73·538-73·500-73·37=73·(538-500-37)=73·1=73
b)3+6+9...90=3·(1+2+3...30)=3·(31·15)=1395
c)300·299+299·298-598·198=299·(300+298)-598·198=299·598-598·198=
=598·(299-198)=598·101=60398

3)41+x=8+x+6+x+4+x+2+x
4x-x=41-20
3x=21
x=21÷3
x=7
peste 7 ani

4)(12·x+24)÷12-625÷125=1
(12·x+24)÷12-5=1
(12·x+24)÷12=1+5
(12·x+24)÷12=6
12·x+24=6·12
12·x+24=72
12·x=72-24
12·x=48
x=48÷12
x=4

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