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a. 0,15 x 1000 x 9 + 10 x 15 = 150 x (9+1) =1500
b. 20,2 x 5,1 – 60,6 x 1,7 + 17,8 = 20,2 x (5,1 - 5,1) + 17,8 = 17,8
\(A=\frac{8.4.125.25+96524+476}{10.125.4.25.8}\)
\(A=\frac{1000.100+96524+476}{10.1000.100}\)
\(A=\frac{100000+96524+476}{1000000}\)
\(A=\frac{100000+97000}{1000000}=\frac{197000}{1000000}=\frac{197}{1000}\)
\(A=0,197\)
a ) 0.8 x 0.04 x 1.25 x 25 x 0.6524 x 0.3467
= ( 0.8 x 1.25 ) x ( 0.04 x 25 ) x 0.6524 x 0.3467
= 1 x 1 x 0.6524 x 0.3467
= 0.6524 x 0.3476
Vậy ta được phép tính thu gọn là
0.6524 x 0.3476
b ) 10 x 125 x 4 x 25 x 8
= 10 x (125 x 8) x (4 x 25)
= 10 x 1000 x 100
= (10x 100) x 1000
= 1000 x 1000
= 10002
Vậy phét tính thu gọn là 10002
0,8x0,04 x1,25 x 25 x 0, 6524 x 0,3476
= ( 0,8x1,25) x ( 0,04 x 25) x ( 0,6524 x 0,3476)
= 1x10 x 0,22677424
= 2,2677424
10x125 x 4 x 25 x 8
= 10 x ( 125 x8 ) x ( 4 x 25 )
= 10 x1000 x100
= 1000000
k minh nha
Bài 1
a) \(5\times72\times10\times2=\left(5\times2\times10\right)\times72=100\times72=7200\)
b) \(40\times125=5\times\left(8\times125\right)=5\times1000=5000\)
c) \(16\times6\times25=4\times4\times6\times25=\left(4\times6\right)\times\left(4\times25\right)=24\times100=2400\) Bài 2:
a) \(24\times57+43\times24=24\times\left(57+43\right)=24\times100=2400\)
b) \(12\times19+80\times12+12=12\times\left(19+80+1\right)=12\times100=1200\)
c) \(\left(36\times15\times169\right)\div\left(5\times18\times13\right)\)
\(=\left(18\times2\times3\times5\times13\times13\right)\div\left(5\times18\times13\right)\)
\(=\left(2\times3\times13\right)\times\left(18\times5\times13\right)\div\left(5\times18\times13\right)\)
\(=2\times3\times13\)
\(=78\)
d) \(\left(44\times52\times60\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times11\times4\times13\times4\times15\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times4\times4\right)\times\left(11\times13\times15\right)\div\left(11\times13\times15\right)\)
\(=4\times4\times4\)
\(=64\)
Bài 3:
a) \(x-280\div35=5\times54\)
\(x-8=270\)
\(x=270+8\)
\(x=278\)
b) \(\left(x-280\right)\div35=54\div4\)
\(\left(x-280\right)\div35=\dfrac{27}{2}\)
\(x-280=\dfrac{27}{2}\times35\)
\(x-280=\dfrac{945}{2}\)
\(x=\dfrac{945}{2}+280\)
\(x=\dfrac{1505}{2}\)
c) \(\left(x-128+20\right)\div192=0\)
\(x-128+20=0\times192\)
\(x-128+20=0\)
\(x-128=0-20\)
\(x-128=-20\)
\(x=-20+128\)
\(x=108\)
d) \(4\times\left(x+200\right)=460+85\times4\)
\(4\times\left(x+200\right)=460+340\)
\(4\times\left(x+200\right)=800\)
\(x+200=800\div4\)
\(x+200=200\)
\(x=200-200\)
\(x=0\)
Bài 4:
a) \(\dfrac{7}{12}-\dfrac{5}{12}=\dfrac{2}{12}=\dfrac{1}{6}\)
b) \(\dfrac{8}{11}+\dfrac{19}{11}=\dfrac{27}{11}\)
c) \(\dfrac{3}{8}+\dfrac{5}{12}=\dfrac{9}{24}+\dfrac{10}{24}=\dfrac{19}{24}\)
d) \(\dfrac{3}{4}+\dfrac{7}{12}=\dfrac{9}{12}+\dfrac{7}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)
Bài 5:
a) \(x-\dfrac{6}{7}=\dfrac{5}{2}\)
\(x=\dfrac{5}{2}+\dfrac{6}{7}\)
\(x=\dfrac{47}{14}\)
b) \(\dfrac{12}{7}\div x+\dfrac{2}{3}=\dfrac{7}{5}\)
\(\dfrac{12}{7}\div x=\dfrac{7}{5}-\dfrac{2}{3}\)
\(\dfrac{12}{7}\div x=\dfrac{11}{15}\)
\(x=\dfrac{12}{7}\div\dfrac{11}{15}\)
\(x=\dfrac{180}{77}\)
Lần sau ghi rõ đề hơn nhé! Dấu . là dấu nhân! Để cho khỏi nhầm lẫn với x
Tìm x:
a) x : 0,01 + x : 2/10 + x . 20 = 125 (Đổi 2/10 = 2 : 10 = 0,2)
Tương đương với: x : 0,01 + x : 0,2 + x . 20 = 125
= x : (0,01 + 0,2) + (x . 20) = 125
= x : 0,21 + x . 20 = 125
= x : (0,21 + 20) = 125
= x : 20,21 = 125
Suy ra x = 125 x 20,21 = 2526,25
b) x : 0,25 + x : 0,5 = 12,6
Tương dương với: x : (0,25 + 0,5) = 12,6
= x : 0,75 = 12,6
Suy ra x = 12,6 x 0,75 = 9,45
Đs: . . . . . . .
4 x 20 x 25 x 5 x 125 x 10 x 10 x 8 = ( 25 x 4 ) x ( 20 x 5 ) x ( 125 x 8 ) x ( 10 x 10 )
= 100 x 100 x 1000 x 100
= 1 000 000 000
4x20x25x5x125x10x10x8
=(4x25)x(125x8)x(10x10)x(20x5)
=100x1000x100x100
=1000000000