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JackRussell
@JackRussell
July 2022
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Найдите значение выражения:
1)3(a+2b)-a при a+3b=1,1
2)2,4 (3x+5y)-4y при 0.9x+y=2
3)8(0.5a+3b)+8a при a+2b=2,5
4)3(0.6m+5n)-3n при 0,3m+2n=4
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Vspak0999
3(a+2b)-a=3а+6b-a=2a+6b=2(a+3b)=2*1.1=2.2
2.4(3x+5y)-4y=7.2x+12y-4y=7.2x+8y=8(0.9x+y)=8*2=16
8(0.5a+3b)+8a=4a+24b+8a=12a+24b=12(a+2b)=12*2.5=30
3(0.6m+5n)-3n=1.8m+15n-3n=1.8m+12n=6(0.3m+2n)=6*4=24
2 votes
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JackRussell
Спасибо большое
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Answers & Comments
2.4(3x+5y)-4y=7.2x+12y-4y=7.2x+8y=8(0.9x+y)=8*2=16
8(0.5a+3b)+8a=4a+24b+8a=12a+24b=12(a+2b)=12*2.5=30
3(0.6m+5n)-3n=1.8m+15n-3n=1.8m+12n=6(0.3m+2n)=6*4=24