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a) Đề:........
= 18. (73 + 15 + 12)
= 18. 100
= 18000
b) Đề nên sửa 23 thành 25
= 100 : { 250 : [ 450 - (4. 125 - 4.25)]}
= 100 : { 250 : [ 450 - (500 - 100)]}
= 100 : { 250 : [ 450 - 400 ]}
= 100 : { 250 : 50 }
= 100 : 5
= 20
a) 18.73+15.18+12.18
=18.(73+15+12)
=18.100
=1800
b) (37+63):{250:[450-(4.53-22.23)]}
=(37+63):{250:[450-(22.53-22.23)]}
=100:{250:[450-22.(53-23)]}
=100:{250:[450-22.102]}
=100:{250:[450-408]}
=100:{250:42}
=100:\(\frac{125}{21}\)
=\(\frac{84}{5}\)
a,714+382+286+318
\(=\left(714+286\right)+\left(382+318\right)\)
\(=1000+700\)
= \(1700\)
b,18.73+15.18+12.18
\(=18.\left(73+15+12\right)\)
\(=18.100\)
\(=1800\)
c,(37+63) : {250:[450-(4.5^3-2^2.25)]}
\(=100:\left\{250:\left[450-\left(2^2.125-2^2.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2^2.\left(125-25\right)\right)\right]\right\}\)
\(=100:\left\{250:\left[450-400\right]\right\}\)
\(=100:\left\{250:50\right\}\)
\(=100:5\\ =20\)
CHÚC BANJ HỌC TỐT!!
a) 714+382+286+318
=(714+286)+(382+318)
=1000+700
=1700
b) 18.73+15.18+12.18
=18.(73+15+12)
=18.100
=1800
c) (37+63):{250:[450-(4.5^3-2^2.25)]}
=100:{250:[450-(4.125-4.25)]}
=100:{250:[450-4.(125-25)]}
=100:{250:[450-4.100]}
=100:{250:[450-400]}
=100:{250:50}
=100:5
=20
-Chúc bạn học tốt-
Sửa đề: 8666
8666*15+170*4333
=4333*(2*15+170)
=200*4333
=866600
A = 44 . 82 -22 + 18 . 44
= 44 . 82 - 4 + 18 . 44
= 44. ( 82 + 18 ) - 4
= 44 . 100 - 4
= 4400 - 4
= 4396
Ta có: \(A=44\cdot82-2^2+18\cdot44\)
\(=44\cdot\left(82+18\right)-4\)
\(=44\cdot100-4\)
\(=4400-4=4396\)
13: \(\left(-15\right)+8+7\)
\(=\left(-15\right)+\left(8+7\right)\)
=-15+15
=0
14: \(\left(-8\right)+2+6\)
\(=\left(-8\right)+\left(2+6\right)\)
=-8+8
=0
15: \(\left(-1\right)+3-2\)
\(=\left(-1-2\right)+3\)
=-3+3
=0
16: \(25-8-7\)
\(=25-\left(8+7\right)\)
=25-15
=10
17: \(8-2-6\)
\(=8-\left(2+6\right)\)
=8-8
=0
18: \(\left(-12\right)-3+15\)
\(=\left(-12-3\right)+15\)
=-15+15
=0
18,73+24,56+81,27+75,44
=[18,73 +81,27]+[24,56+75,44]
= 10 ,00 + 10,00
= 10+10
= 20
CHO MÌNH NHÉ