13+5(X-2)=13+5X-10=3+5X
16+2(a+3)=16+2a+6=22+2a
2m+4(2+m)-8=2m+8+4m-8=6m
5(2m+3n)+3(4m+2n)=10m+15n+12m+6n=22m+21n
11(a+b)+4(2a+2b)=11a+11b+8a+8b=19a+19b
a) при X=18 4(2X+3)+5(X+6)=8X+12+5X+30=13X+42=13×18+42=234+42=276
б)при a=5,b=7 4b+5(a+b)+2a+8(a+b)=4b+5a+5b+2a+8a+8b=17b+15a=17×7+15×5=119+75=194
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13+5(X-2)=13+5X-10=3+5X
16+2(a+3)=16+2a+6=22+2a
2m+4(2+m)-8=2m+8+4m-8=6m
5(2m+3n)+3(4m+2n)=10m+15n+12m+6n=22m+21n
11(a+b)+4(2a+2b)=11a+11b+8a+8b=19a+19b
a) при X=18 4(2X+3)+5(X+6)=8X+12+5X+30=13X+42=13×18+42=234+42=276
б)при a=5,b=7 4b+5(a+b)+2a+8(a+b)=4b+5a+5b+2a+8a+8b=17b+15a=17×7+15×5=119+75=194