c1 A= 7.(-10)+(-10).2
c2B=8.(-35)+(-35).2
\(\frac{19}{10}-\left(\frac{2}{35}-\frac{1}{10}\right)-\frac{33}{35}\)
(x –15) .15 = 0 b) 32 (x –10 ) = 32
c) ( x – 5)(x – 7) = 0 d) (x – 35).35 = 35
Tính hợp lí
32.(10-35)-35.(18-32)
Tìm x:
a) (3x-12) : 8 + 10 = 13
b) (x + 5).8-20 = 60
c) 3.[ 35 + (x-10) ] - 375 = 0
d) ( 158x+ 173 - 24 ) : 35 = 81
e) x - 140 : 35 =0
Bài 6. Tìm x ϵ N biết
a) (x –15) .15 = 0
b) 32 (x –10 ) = 32
c) ( x – 5)(x – 7) = 0
d) (x – 35).35 = 35
a)x-280:35=5.54 b)(x-280):35=10 c)2448:[119-(x-6)]=24
2×3×5+4×9×25+6×9×35+10×21×40
_____________________________________
2×3×7+4×9×35+6×9×49+10×21×56
316 + \{- 10 + [35 + (- 316)]\}
Bài 6. Tìm x ϵ N biết
a) (x –15) .15 = 0
b) 32 (x –10 ) = 32
c) ( x – 5)(x – 7) = 0
d) (x – 35).35 = 35
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