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a) 37,5 . 6,5 – 7,5 . 3,4 – 6,6 . 7,5 + 3,5 . 37,5
= (37,5 . 6,5 + 3,5 . 37,5) - (7,5 . 3,4 + 6,6 . 7,5)
= 37,5(6,5 + 3,5) - 7,5(3,4 + 6,6)
= 37,5 . 10 - 7,5 . 10
= 375 - 75 = 300.
b) 452 + 402 – 152 + 80 . 45 = 452 +2 . 40 . 45 + 402 – 152
= (40 + 45)2 – 152 = 852 – 152 = (85 – 15)(85 + 15) = 70 . 100 = 7000.
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\(=7,2-3,7+2,8+0,3\)
\(=\left(7,2+2,8\right)-\left(3,7-0,3\right)\)
\(=10-3,4\)
\(=6,6\)
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a)\(37.x6.5-7.5x3.4-6.6x7.5+3.5x37.5\)
=\(7.5x5x6.5-7.5x3.4-6.6x7.5+3.5x7.5x5\)
=\(7.5x\left(5x6.5-3.4-6.6+3.5x5\right)\)
=\(7.5x\left(2x6.5-10\right)\)
=\(7.5x\left(13-10\right)\)
=\(7.5x3\)
=\(22.5\)
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(-3,75).(-7,2)+2,8.3,75=3,75.(7,2+2,8)
=3,75.10
=37,5
kb vs mk nhé,đc ko?
\(-37,5\times\left(-7,2\right)+28\times3,75\)
\(\Leftrightarrow37,5\times7,2+2,8\times37,5\)
\(=37,5\times\left(7,2+2,8\right)\)
\(=37,5\times10\)
\(=375\)
~Std well~
#Thạc_Trân
-37.5 × ( - 7.2 ) + 28 × 3.75
= 37.5 × 7.2 + 28 × 3.75
= 37.5 × 7.2 + 2.8 × 37.5
= 37.5 × ( 7.2 + 2.8 )
= 37.5 × 10
= 375
Cbht