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x : 5 = 25 ( dư 4 )
x = 25 . 5 + 4
x = 125 + 4
x = 129
phần b tương tự
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[1+2+3.....+8+9+10)x[6x8-48)
= [1+2+3.....+8+9+10)x[48-48)
=[1+2+3.....+8+9+10)x0
=0
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a)
b)
3 x 4 + 8 = 12 + 8 = 30
48 : 8 + 7 = 6 + 7 = 13
9 : 9 x 0 = 1 x 0 = 0
7 x 10 – 14 = 70 – 14 = 56
72 : 9 – 6 = 8 – 6 = 2
0 : 6 + 37 = 0 + 37 = 37
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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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6 x 6 = 36 7 x 9 = 63 8 x 7 = 56 9 x 6 = 54
48 : 6 = 8 54 : 6 = 9 42 : 6 = 42 63 : 7 = 9
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6 x 6 = 36 7 x 9 = 63 8 x 7 = 56 9 x 6 = 54
48 : 6 = 8 54 : 6 = 9 42 : 6 = 42 63 : 7 = 9