3000:27-1650:27
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= 27 x 45 + 27 x 55
= 27 x (45 + 55)
= 27 x 100
= 2700
(-12) + (-18)
= -30
------------------
(-90) + 27 + (-10) + 73
= [(-90) + (-10) + (27 + 73)
= -100 + 100
= 0
---------------------------------
25 . (-5) . (-4)
= 25 . (-4) . (-5)
= -100 . (-5)
= 100 . 5
= 500
----------------------------------------
(-15) . 40 : 6
= [(-15) . 40] : 6
= (-600) : 6
= -100
-----------------------------------
(-27) . 58 + (-27) . 42
= (-27) . (58 + 42)
= (-27) . 100
= -2700
85(35-27)-35(85-27)=85.35-85.27-35.85+35.27
=(85.35-35.85)+(35.27-85.27)
=0+27.(35-85)
=27.(-40)
=-1080
85(35-27)-35(85-27)
= 85.35-85.27-35.85-35.27
=(85.35-35.85)+(35.27-85.27)
=0+27.(35-85)
=27.(-40)
= 1080
\(a.\left(47\times27\right)\times\left(-13\right)+13\left(-53-27\right)\)
\(=1269\times\left(-1\right)\times13+13\left(-80\right)\)
\(=13\left(-1269\right)+13\left(-80\right)\)
\(=13\left[\left(-1269\right)+\left(-80\right)\right]\)
\(=13\left(-1349\right)\)
\(=-17537\)
\(b.-17\left(13+5\right)-13\left(-17-2\right)\)
\(=13\left(-17\right)+5\left(-17\right)-13\left(-17\right)+13.2\)
\(=0-85+26\)
\(=-59\)
( 43 − 13 ) . ( − 3 ) + 27. ( − 14 − 16 ) = 30. ( − 3 ) + 27. ( − 30 ) = ( − 30 ) .3 + 27. ( − 30 ) = ( − 30 ) . ( 3 + 27 ) = ( − 30 ) .30 = − 90
(47.27).(-13)+13.(-53-27)
=1269.(-13)+13.(-80)
=1269.13.(-1)+13.(-80)
=(1269-80).13.(-1)
=1189.13.(-1)
=15487.(-1)
=-15487
\(\left(47\cdot27\right)\cdot\left(-13\right)+13\cdot\left(-53\cdot27\right)\)
\(=\left(-47\cdot27\right)\cdot13+13\cdot\left(-53\cdot27\right)\)
\(=13\left[\left(-47\cdot27\right)+\left(-53\cdot27\right)\right]\)
\(=13\left\{27\cdot\left[\left(-47\right)+\left(-53\right)\right]\right\}\)
\(=13\cdot\left\{27\cdot\left(-100\right)\right\}\)
\(=13\cdot\left(-2700\right)\)
\(=-35100\)
\(\text{48.27 + (-27).18 }\)
\(=27.\left(48-18\right)\)
\(=27.30\)
\(=810\)
48.27 + (-27).18
= - 27 . ( 18 - 48 )
= - 27 . ( - 30)
= 810
Học tốt
\(125\times32\times27=125\times8\times4\times27\)\(=1000\times108=108000\)
\(3000:27-1650:27\\ =\left(3000-1650\right):27\\ =1350:27\\ =50\)