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( 189 x 101 - 189 ) - (185 x 99 - 185)
=189 ( 100 -1 ) - 185 x ( 99 -1 )
=189 x 100 - 185 x 98
=18900 - 18130
=770
( 189 x 101- 189 ) - ( 185 x 99 - 185 )
= 18900 - 18130
= 770
k mk nha bạn
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a) \(30\times1235\times4-8\times235\times15\)
\(=120\times1235-120\times235\)
\(=120\times\left(1235-235\right)\)
\(=120\times1000\)
\(=120000\)
b) \(\left(120\times99+120\right)-185\times101+185\)
\(=120\times\left(99+1\right)-185\cdot\left(101-1\right)\)
\(=120\times100-185\times100\)
\(=12000-18500\)
\(=-6500\)
a) 30 x 1235 x 4 - 8 x 235 x 15
=(30x4) x 1235 - (8x15)x235
= 120 x 1235 - 120 x 235
=120 x (1235-235)
=120 x 1000
=120000
b) ( 120 x 99 +120) - 185 x 101-185
=(120 x 99 + 120) - (185x101+185)
=120x(99+1) - 185x(101+1)
=120 x 100-185x102
=12000-18870
= -(18870-12000)
= -6870
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\(185\)x \(573\)
= \(106005\)
k nha mình k lại
Ngô Đức Hoàng
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2x85+15x1=185
Câu trả lời đúng
Xx85+15xX=185
Xx(85+15)=185
Xx100=185 X=185:100 X=1.85