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7+7+7+7=7x4
6+6+6+6+6=6x5
a+a+a+a+a=5
bai 2
8x6+8=8x7
9x2+9x4=9x6
bx3+bx5=bx8
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1, a+ax2+ax3+ax4
=a x 1+ax2+ax3+ax4
= a x (1+2+3+4) = a x 10
2, b x 5 + b x 4 + b x 6
= b x (5+4+6) = b x 15
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a / 75 + 10 x 10 = 25 x 3 + 2 x 5 x 2 x 5= 25 x 3 + 25 x 4= 25 x ( 3 + 4 ) = 25 x 7
b/ 45 - ( 16 + 4 ) = 5 x 9 - ( 4 x 4 + 4 x 1 ) = 5 x 9 - 4 x ( 4 + 1 ) = 5 x 9 - 4 x 5 = 5 x 9 - 5 x 4 = 5 x ( 9 - 4 ) = 5 x 5
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23 + 39 + 37 + 21 + 34 + 26
= (23 + 37) + (39 + 21) + (34 + 26)
= 60 + 60 + 60
= 60 x 3
= 180
23 + 39 + 37 + 21 + 34 + 26
=(23 + 37) + (39 + 21) + (34 + 26)
=60 + 60 + 60
=60 × 3
=180
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(24 + 6 x 5 + 6 ) – (12 + 6 x 3)
= (6 x 4 + 6 x 5 + 6 x 1) – (6 x 2 + 6 x 3)
= 6 x (4 + 5 + 1) – 6 x (2 + 3)
= 6 x 10 – 6 x 5
= 6 x (10 – 5)
= 6 x 5
= 30
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15 x 5 + 3 x 5 + 5 x 2 – 10 x 5
= 5 x (15 + 3 + 2 – 10)
= 5 x 10
= 50
a, 8x6+8= 8x(6+1)= 8x7
b, 9x2+9x4= 9x(2+4)= 9x6
C, bx3+bx5= bx(3+5)= bx8
Ok. Ok
a, 8x6+8
=8x(6+1)
=8x7=56
b,9x2+9x4
=9x(2+4)
=9x6=54
c,bx3+bx5
=bx(3+5)
bx8=8b