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1 + 1 = 2
8 + 9 = 17
90 . 1 234 = 111 060
85 475 + 9 650 = 95 125
12 + 67 = 79
chúc bn hok tốt ~
1+1=2
8+9=17
90 x 1234=111060
85475+9650=95125
12+67=79
học tốt
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x+12=3
=> x=3-12
=> x=-9
x+43=67
=> x=67-43
=> x=24
x+23=67
=> x=67-23
=> x=44
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11 + 67 x 24 + 12 + 55 - 24
= 11 + 55 + 67 x 24 - 24 + 12
= 66 + 24 x (67 - 1) + 12
= 66 + 24 x 66 + 12
= 66 x (24 + 1) + 12
= 66 x 25 + 12
= 1650 + 12
= 1662
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a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
`67+3+12+8=70+12+8=82+8=90`
90