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1. Решите :
a) 5a + 3a - 4a +7
б) 7(x-3) + 2(5-y)
в) 11x + 11y - 4x +15y
г) 2(a + 2b) - 3(b-3a) +5
1. Решите :
a) 5a + 3a - 4a +7
б) 7(x-3) + 2(5-y)
в) 11x + 11y - 4x +15y
г) 2(a + 2b) - 3(b-3a) +5
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2) 7 (х-3) + 2 (5-у)=7х-21+10-2у= 7х-2у-11
3) 11х+11у-4х+15у=7х+26у
4) 2 (а+2b)-3 (b-3a)+5= 2a+4b-3b+9a+5=11a+b+5