Ответ:
1) -3(2m+3n)+2(3m-5p)=-6m-9n+6m-10p=-9n-10p=-9×(-4)-10×5,7=36-57=-21
2) 63-21/4x+15/4x+90=153-3/2x=153+3/2×2/5=153 3/5
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Ответ:
1) -3(2m+3n)+2(3m-5p)=-6m-9n+6m-10p=-9n-10p=-9×(-4)-10×5,7=36-57=-21
2) 63-21/4x+15/4x+90=153-3/2x=153+3/2×2/5=153 3/5