3,5 x 20,5 - 15,5 x 30 + 3,5 x 9,5
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\(-15,5\times20,8+3,5\times9,2-15,5\times9,2+3,5\times20,8.\)
\(=20,8\times\left(3,5-15,5\right)+9,2\times\left(3,5-15,5\right)\)
\(=\left(3,5-15,5\right)\times\left(20,8+9,2\right)\)
\(=\left(-12\right)\times30\)
\(=-360\)
-15,5 x 20,8 + 3,5 x 9,2- 15,5 x 9,2 + 3,5 x 20,8=-360
k mk nha mn
\(x\div6,14=21,2-13,7\)
\(x\div6,14=7,5\)
\(x=7,5\times6,14\)
\(x=46,05\)
\(x\div3,5=50-9,5\)
\(x\div3,5=40,5\)
\(x=40,5\times3,5\)
\(x=141,75\)
\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
\(=-15,5\left(20,8+9,2\right)+3,5\left(9,2+20,8\right)\)
\(=\left(-15,5\right).30+3,5.30\)
\(=30.\left(-12,5\right)\)
\(=-375\)
\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
\(=20,8.\left(-15,5+3,5\right)+9,2.\left(-15,5+3,5\right)\)
\(=\left(-15,5+3,5\right).\left(20,8+9,2\right)\)
\(=\left(-12\right).30\)
\(=-360\)
Vậy : \(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8=-360\)
\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
= \(20,8.\left(-15,5+3,5\right)+9,2.\left(-15,5+3,5\right)\)
= \(20,8.\left(-12\right)+9,2.\left(-12\right)\)
= \(\left(20,8+9,2\right).\left(-12\right)\)
= \(30.\left(-12\right)\)
= \(-360.\)
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= -15,5 .( 20,8 - 9,2) + 3,5 . (9,2+20,8)
=-15,5 . 11,6 + 3,5 .30
=-179,8+105
=-74,8
3,5 x 20,5 - 15,5 x 30 + 3,5 x 9,5
= 3,5 x ( 20,5 + 9,5 ) - 15,5 x 30
= 105 - 465
= -360
3,5 x 20,5 - 15,5 x 30 + 3,5 x 9,5
\(=\left(20,5+9,5\right)\times3,5+30\times15,5=105-465=-360\)