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a) 2 x 3 x 4 x 8 x 50 x 25 x 125
= (2 x 50) x (4 x 25) x (8 x 125) x 3
= 100 x 100 x 1000 x 3
= 30 000 000
b) 45 x 128 90 x 64
= (45 x 64) x 128 90
= 2880 x 128 90
= 37 123 200
_HT_
Ta có : \(\frac{0,125x25x8}{16x45x0,0625-20}=\frac{\left(0,125x8\right)x25}{\left(16x0,0625\right)x45-20}=\frac{1x25}{1x45-20}=\frac{25}{25}=1\)1
Tk nha bạn =))
Giải
18,6 * 0,5 * 20 = 18,6 * (0,5 * 20) = 18,6 * 10 = 186
2,5 * 65 * 4 = (2,5 * 4) * 65 = 10 * 65 = 650
16 * 25 * 55 =(4 * 4) * 25 * 55 =(4 * 25) * (4 * 55) =100 * 220 = 22000
28,3 * 0,2 * 500 =28,3 * (0,2 * 500) =28,3 * 100= 2830
1,25 * 45 * 8 =(1,25 * 8) * 45 =10 * 45 =450
3,6 * 44 + 1,8 * 12 =(1,8 * 2) * 44 + 1,8 * 12 =1,8 * (2 * 44 + 12) =1,8 * 100 = 180
Nhớ tích đúng cho mình nha và chúc bạn học giỏi nhé
a,18,6x0,5x20=18,6x(0,5x20)=18,6x10=186
b, 2,5x65x4=(2,5x4)x65=10x65=650
c, 16x25x55=400x55=22000
d, 28,3x0,2x500=28,3x(0,2x500)=28,3x100=2830
g, 1,25x45x8=(1,25x8)x45=10x45=450
h, 3,6x44+1,8x12= 1,8x100=180
a) 19,17x25x4=19,17(25x4)=19,17x100=1917
b)1,79x(8x125)=1,79x1000=1790
chúc bạn học tốt
a ) 2 x 3 x 4 x 8 x 50 x 25 x 125
= 3 x 2 x 50 x 4 x 25 x 8 x 125
= 3 x ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 )
= 3 x 100 x 100 x 1000
= 30000000
b ) 45 x 128 - 90 x 64
= 45 x ( 2 x 64 ) - 90 x 64
= ( 45 x 2 ) x 64 - 90 x 64
= 90 x 64 - 90 x 64
= 0
a) = (2.50).(4.25).(8.125).3=100.100.1000.3=30000000
b)45.128-90.64=45.128-45.2.64
=45.128-45.128
=0
= 25 x 75/100 + 75 x 0.92 + 25 x 0.25 + 75 x 8/100
= 25 x 0.75 + 75 x 0.92 + 25 x 0.25 + 75 x 0.08
= 25 x ( 0.75 + 0.25 ) + 75 x ( 0.92 + 0.08 )
= 25 x 1 + 75 x 1
= ( 25 + 75 ) x 1
= 100 x 1
= 100
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
16x48+8x48+16x28= 16x48+16x24+16x28
=16x(48+24+28)
=16x100
=1600
a; \(\dfrac{21}{11}\) x \(\dfrac{22}{17}\) x \(\dfrac{68}{63}\)
= \(\dfrac{21\times11\times2\times17\times4}{11\times17\times21\times3}\)
= \(\dfrac{11\times17\times21}{11\times17\times21}\) x \(\dfrac{2\times4}{3}\)
= 1 x \(\dfrac{8}{3}\)
= \(\dfrac{8}{3}\)
b; \(\dfrac{5}{14}\) \(\times\) \(\dfrac{7}{13}\) x \(\dfrac{26}{25}\)
= \(\dfrac{5\times7\times2\times13}{7\times2\times13\times5\times5}\)
= \(\dfrac{5\times7\times2\times13}{5\times7\times2\times13}\) x \(\dfrac{1}{5}\)
= 1 x \(\dfrac{1}{5}\)
= \(\dfrac{1}{5}\)
a) \(\frac{28.36}{27.14}=\frac{7.4.9.2.2}{3.9.7.2}=\frac{4.2}{3}=2\)
b) \(\frac{132.45.8}{25.16.99}=\frac{2.2.3.11..3.3.5.2.2.2}{5.5.2.2.2.2.3.3.11}=\frac{2.3}{5}=\frac{6}{5}\)