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123-76=47
56-51=5
78-56=22
56-7x5=21
53-23=30
42:2=21
chúc bạn học giỏi hơn
tk mình nha
123-76=47 : 56-51=5 : 78-56=22
56-(7x5)
56-35=21 : 53-23=30 : 42 :2=21
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7 : 7 = 1
42 : 7 = 6
35 : 7 = 5
14 : 7 = 2
56 : 7 = 8
63 : 7 =
21 : 7 =
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x + 3 x 7 = 56 x - 7 x 3 = 85
x + 21 = 56 x - 21 = 85
x = 56 - 21 x = 85 + 21
x = 35 x = 106
k nhé ma kết là tôi
x = 3 x 7 = 56
=> x + 21 = 56
=> x= 56 - 21
=> x = 35
x- 7 x 3 = 85
=> x- 21 = 85
=> x= 85 + 21
=> x= 106
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7 x 8 = 56 5 x 6 = 30
56 : 7 = 8 30 : 5 = 6
56 : 8 = 7 30 : 6 = 5
56:7=8
67 x 4=268
534 x 8=4272
HT
56:7=8
67 nhân4=268
534 nhân8=4272