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a) x - 100 = 540
x = 540 + 100
x = 640
b) 10 + x = 100
x = 100 - 10
x = 90
c) 54 : x = 6
x = 54 : 6
x = 9
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37 x 18 - 9 x 14 + 100
=37*2*9-9*14+100
=74*9-9*14+100
=9*(74-14)+100
=9*60+100
=540+100
=640
15 x 2 + 15 x 3 + 15 x 5
=15*(2+3+5)
=15*10
=150
52 + 37 + 48 + 63
=(52+48)+(37+63)
=100+100
=200
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9 x 6 = 54 9 x 7 = 63 9 x 5 = 45 9 x 8 = 72
54 : 9 = 6 63 : 9 = 7 45 : 9 = 5 72 : 9 = 8
54 : 6 = 9 63 : 7 = 9 45 : 5 = 9 72 : 8 = 9
9 x 6 = 54 9 x 7 = 63 9 x 5 = 45 9 x 8 = 72
54 : 9 = 6 63 : 9 = 7 45 : 9 = 5 72 : 9 = 8
54 : 6 = 9 63 : 7 = 9 45 : 5 =9 72 : 8 =9
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9 x 5 = 45
9 x 6 = 54
9 x 7 = 63
9 x 8 = 72
45 : 9 = 5
54 : 9 = 6
63 : 9 = 7
72 : 9 = 8
45 : 5 = 9
54 : 6 = 9
63 : 7 = 9
72 : 8 = 9
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a) 6 x 10 x 100 x 0 + 2017
= 0 + 2017
= 2017
b) 402 - 46 + 298 - 600 - 54
= (402 + 298) - (46 + 54) - 600
= 700 - 100 - 600
= 0
x = 63 + 3 = 66
54 + x = 100
x = 100 - 54 = 46
x-3=63
x=63-3
x=60
54+x=100
x=100-54
x=46
k cho mik nha