Tính bằng cách hợp lí:
0,37 + 37/50 + 26% + 63/100
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a) \(=38\left(63+37\right)=38.100=3800\)
b) \(=53\left(12+172-84\right)=53.100=5300\)
c) \(=35\left(34+38\right)+65\left(75+45\right)=35.72+65.120=10422\)
d) \(=39.8+15.8+21.8=8\left(39+15+21\right)=8.75=600\)
e) \(=36\left(28+82\right)+64\left(69+41\right)=36.110+64.110=110\left(36+64\right)=110.100=11000\)
\(\dfrac{240.50+48.100}{42.37+21.126}\)
\(=\dfrac{24.5.10.10+48.100}{42.37+3.7.6.21}\)
\(=\dfrac{100.100+48.100}{42.37+42.63}\)
\(=\dfrac{100.\left(100+48\right)}{42.\left(37+63\right)}\)
\(=\dfrac{100.148}{42.100}\)
\(=\dfrac{148}{42}\)
\(=\dfrac{74}{21}\)
A, 2 x 26 x 5 =( 5 x 2) x 26
10 x 26
=260
b,4 x 37 x 25 =( 4 x 25) x 26
= 100 x 26
= 3700
c, 25 x 5 x 4 x 27 x 2 =( 25 x 4 ) x ( 2x 5) x 27
= 100 x 10 x 27
= 1000x 27
=27000
d,28 x 64 + 28 x 36 = 28 x ( 64 + 36 )
= 28 x 100
=2800
e, 769 x 85 - 769 x 75 = 769 x ( 85 - 75 )
=769 x 10
=7690
f, 56 x 37 + 56 x 63 = 56 x ( 37 + 63 )
= 56 x 100
=5600
a. = 26 x (2 x 5)
= 26 x 10 =260
b.=( 25x4) x37
=100 x37=3700
c.=(25x4) x(5x2) x27
=100 x10 x27
= 27000
d.=28 x( 64+36)
=28 x100
= 2800
e.=769 x( 85-75)
=769 x10 =7690
f. =56 x(37 +63)
=56 x100
= 5600
\(0.37\cdot4.3+37\%\cdot\frac{57}{10}=\frac{37}{100}\cdot\frac{43}{10}+\frac{37}{100}\cdot\frac{57}{10}\)
=\(\frac{37}{100}\cdot\left(\frac{43}{10}+\frac{57}{10}\right)\)
=\(\frac{37}{100}\cdot10\)
=\(\frac{37}{10}\)
hk tốt nhé
0,37 x 4,3 + 37% x \(\frac{57}{10}\)= 0,37 x 4,3 + 0,37 x 5,7
= 0,37 x ( 4,3 + 5,7 )
= 0,37 x 10
= 3,7
Lời giải:
a. $=-(37+63)+[25+(-25)]+(-9)=-100+0+(-9)=-(100+9)=-109$
b. $=[1+(-3)]+[5+(-7)]+....+[21+(-23)]$
$=\underbrace{(-2)+(-2)+....+(-2)}_{6}=(-2).6=-12$
c. $=-(280+20)+[-(79+21)]=-300+(-100)=-(300+100)=-400$
d. $=[-(27+43)]+[-(208+102)]=-70+(-310)=-(70+310)=-380$
e. $=(38+120)-(12+46)=158-58=100$
f. $=9+15+11+24=(9+11)+(15+24)=20+39=59$
0,37 + 37/50 + 26% + 63/100
= 37/100 + 37/50 + 13/50+ 63/100
= ( 37/100 + 63/100 ) + ( 37/50+ 13/50 )
= 1 + 1
= 2
= (0,37 + 63/100) + ( 37/50+ 26%)
= 1+1
=2