Toán Lớp 7: 1 thuc hien phep tinh a) 1/2+(-3/4)+(-5/6) b) 7/15-(-8/5)+(-1/3) c) 8/9+(-5/6)+7/2

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Toán Lớp 7: 1 thuc hien phep tinh a) 1/2+(-3/4)+(-5/6) b) 7/15-(-8/5)+(-1/3) c) 8/9+(-5/6)+7/2

Hoài Hương Tháng Một 5, 2023 Toán học 1 Comment 0 views

Toán Lớp 7: 1 thuc hien phep tinh a) 1/2+(-3/4)+(-5/6) b) 7/15-(-8/5)+(-1/3) c) 8/9+(-5/6)+7/2
2 tinh a) [(1/8:8/27): -1/3 ] : 81/128 b) (-7/15) x 5 /8 – 15/-7 – (-32)
c) -66 x (1/2-1/3+1/11)+124-(-37)+63x(-124) 3 tim x a) 3/35-(3/5+x)=2/7 b) 3/7+1/7:x=3/14
giup mink bai nay duoc ko mik hua se vote 5* a cam on luy ko coppy mang ko coppy bai nguoi khac

quynhmaithu · Answer

1) a) -13/12 b) 26/15 c) 32/9 2) a) [(1/8:8/27):-1/3] : 81/128 = [(27/64:-1/3] : 81/128 = ( -81/64 ) : 81/128 = -2 b) (7/15) x 5/8 -15/-7 - (-32) = 5687/168 c) -66 x (1/2 - 1/3+1/11) + 124-(-37)+63x(-124) = -17 + (-7651) = -7668 3 ) b) 3/7+1/7:x=3/14 <=>1/7x= -3/14 <=> x= -3/2 a) 3/35-(3/5+x)=2/7 <=> 9/175 - 3/35x = 2/7 <=> -3/35x= 41/175 <=> x =-41/15