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x-23=78 67-x=45 x+345=678
x =78+23 x =67-45 x =678-345
x =101 x =22 x =333
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3 × 9 + 4 = 27 + 4 = 31
45 : 5 – 3 = 9 – 3 = 6
78 – 9 : 3 = 78 – 3 = 75
123 + 4 × 8 = 123 + 32 = 155
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x + 120 =500+560 x + 345 =678-321
x+120 = 1060 x + 345 =357
x =1060-120 x = 357-345
x = 940 x = 12
x+120=500+560
x=940
x+345=678-321
x=12
ket qua chuan luon do ban nho k cho minh nha
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TL:
123 + 678 - 78
= 801 - 78
= 723
HT
723