8y-49=72 87-(m+32)=18 (d-17): 8=12 56c-27c=87 344-(x: 12+34)*7 (97+75: (60-5x)*3=336 надо,
293
416
Ответы на вопрос:
1)8y-49=72 8y=49+72 8y=121 y=121÷8 y=15,125 2)m+32=87-18 m+32=18 m=18+32=50 3)d-17=12×8 d-17=96 d=113 4)c(56-27)=87 29×c=87 c=3 5)344-(х÷12+34)×7=29 (х÷12+34)×7=344-29 х÷12+34=315÷7 х÷12+34=45 х÷12=45-34 х÷12=11 х=12×11=132 6)(97+75÷(60-5х)×3)=336 75÷(60-5х)×3=336-97 75÷(60-15х)=239÷3 60-15х=75÷79,7 15х=60-0,9 15х=59,1 х=3,9
1) 7 ( x - 2 )
7x - 7 × 2
7x - 14.
2) 5 ( y- 3 )
5y - 5 × 3
5y - 15
3) 3 ( 15 y + 7 ) + 2 ( 4x + 5 )
45y + 21 + 8y + 10
45y + 31 + 8
4) 6x + 5 ( x - 4 )
6x + 5 - 20
11x - 20
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