tính nhanh hợp lí
-125.5.(-4).(-8).(-25)
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a) 2.(-25).(-4).50 b) -125.5.(-8).2 c) 16.50.(-25).(-250)
= (2.50).[(-25).(-4)] = [(-125).(-8)].(2.5) = 4.4.50.(-25).(-250)
= 100 . 100 = 1000 . 10 = [4.(-25)].[4.(-250)].50
= 10000 = 10000 = [(-100).(-1000)].50
= 100000 .50
= 5000000
a) 2.(-25).(-4).50=(2.50).[(-25).(-4)]=100.100=10000
b)-125.5.(-8).2=[(-125).(-8)].(2.5)=1000.10=10000
c)16.50.(-25).(-250)=4.4.50.(-25).(-250)=[4.(-25)].[4.(-250)].50=(-100).(-1000).50=100000.50=5000000
\(\dfrac{8}{5}\cdot\dfrac{45}{17}\cdot\dfrac{-25}{16}\cdot\dfrac{-34}{9}=\dfrac{8\cdot5\cdot9\cdot25\cdot17\cdot2}{5\cdot17\cdot8\cdot2\cdot9}=\dfrac{25}{9}\) (bỏ đi các dấu trừ vì số âm nhân số âm là số dương)
\(25\cdot\left(-4\right)-54:9+\left(-48\right):\left(-8\right)=-100-6+6=-100\)
a) \(\left(-25\right).5.\left(-4\right).2\)
\(=\left[\left(-25\right).\left(-4\right)\right].\left(2.5\right)\)
\(=100.10=1000\)
b) \(\left(-456\right)-\left(67-456\right)\)
\(=-456-67+456\)
\(=\left(456-456\right)-67\)
\(=67\)
a) 5 . 125 . 2 . 41 . 8
= (5 . 8) . (125 . 2) . 41
= 40 . 250 . 41
= 10 000 . 41
= 410 000
b) 25 . 7 . 10 . 4
= (25 . 4 ) . (10 . 7)
= 100 . 70
= 7000
Chúc bạn học tốt!! ^^
a,5.125.2.41.8=(125.8).(2.5).41=1000.10.41=410000
b,25.7.10.4=(25.4).70=100.70=7000
c,8.12.125.2=(8.125).12.2=100.24=2400
d,4.36.25.50=(4.25).(2.50).18=100.100.18=180000
\(a/ (- 25).(- 125).(- 4). (- 8)=[(-25).(-4)].[(-125).(-8)] =100.1000=100000\)
a/(−25).(−125).(−4).(−8)
= [(−25).(−4)].[(−125).(−8)]
= 100.1000
=100000
b/ (-50) . (-80) . (-2) . (-9)
= [(-50) . (-20)] . [ (-80) . (-9) ]
= 100 . 720
= 72000
\(0,25+25\%\times55+\dfrac{1}{4}\times45-\dfrac{2}{8}\)
\(=\dfrac{1}{4}+\dfrac{1}{4}\times55+\dfrac{1}{4}\times45-\dfrac{1}{4}\)
\(=\dfrac{1}{4}\times\left(1+55+45-1\right)\)
\(=\dfrac{1}{4}\times100\)
\(=25\)
\(0,25+25\%\times55+\dfrac{1}{4}\times45-\dfrac{2}{8}\)
\(=\dfrac{1}{4}+\dfrac{1}{4}\times55+\dfrac{1}{4}\times45-\dfrac{1}{4}\)
\(=\dfrac{1}{4}\times1+\dfrac{1}{4}\times55+\dfrac{1}{4}\times45-\dfrac{1}{4}\times1\)
\(=\dfrac{1}{4}+\left(1+55+45-1\right)\)
\(=\dfrac{1}{4}\times100\)
\(=0,25\times100\)
\(=25\)
\(#:)\)
Ta gộp để thành số tròn:(125.8).(4.25).9=1000.100.9=900 000
-125.5.(-4).(-8).(-25)
=[(-125).(-8)].[(-25).(-4)].5
=1000.100.5
=500000