bạn nào làm nhanh mình tích cho nhưng nhớ tích mình nhé
bài 1: tính nhanh
a) 12+37+28+13
b) -17+(-35)+(-33)+25
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1+2+3+4+5+6+7+8+9+10=55
11+12+13+14+15+16+17+18+19+20=155
1+2+3+4+5+6+7+8+9+10+11+12+13+14 +15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30-50-53=362
a, 28 . (-2).3 - { 136 + [54 - 28 : (69 - 71).2 ]}
=-168- { 136 + [54 - 28 : (-2).2 ]}
=-168 - [136 + (54+28)]
=-168 - 218
=-386
b) 203.46-203.37+203
=203.46-203.37+203.1
=203.(46-37+1)
=203.10
=2030
c)21+23+25+27+29-31-33-35-37-39
=(21-31)+(23-33)+(25-35)+(27-37)+(29-39)
= -10 + (-10) + (-10) + (-10) + (-10)
=-50
d) 18.17-3.6.17
=18.17-18.17
= 0
e,33. ( 107- 112) - 107 . ( 33- 112)
=33.107- 33.112- 107.33+107.112
=(33.107- 33.112- 107.33)+107.112
=33(107-112-107)+107.112
=-33.112+107.112
=112.(-33+107)
=112.74
=8288
CHÚC BẠN MAY MẮN
\(1+2+3+4+5+6+7+8+9+10=55\)
\(11+12+13+14+15+16+17+18+19+20=155\)
a ) 2575 + 37 - 2476 - 29
= (2575 - 2476 ) +( 37 - 29)
= {(2575 + 24) -( 2476 + 24)} + {37 + 1 ) -( 29 +1)}
= ( 2599 - 2500 )+ (38 - 30)
= 99 + 8 =107
b)34 +35 +36+37 - 14 -15 -16-17
= (34 -14) + ( 35 -15 )+ (36 -16) +(37 -17)= 20 * 4= 80. [ Tích cho tui nha ! ]
35 x 25 x 7 x 8 = 49 000
74 x 8 x 12 x 14 = 99 456
_HT_
\(\dfrac{7}{19}x\dfrac{8}{23}+\dfrac{7}{19}x\dfrac{15}{23}+1\dfrac{7}{19}\)
= \(\dfrac{7}{19}x\left(\dfrac{8}{23}+\dfrac{15}{23}\right)+1+\dfrac{7}{19}\)
=\(\dfrac{7}{19}x1+1+\dfrac{7}{19}\)
= \(\dfrac{7}{19}+1+\dfrac{7}{19}=1\dfrac{14}{19}\) = \(\dfrac{33}{19}\)
\(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{3}{21}-\dfrac{17}{32}\)
= \(\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{1}{7}-\dfrac{17}{32}\)
= \(\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{49}{32}-\dfrac{17}{32}\right)\)
= 1 + 1 + 1 = 3
\(\dfrac{8}{9}x\dfrac{15}{16}x\dfrac{24}{25}x\dfrac{35}{36}x\dfrac{48}{49}x\dfrac{63}{64}\)
= \(\dfrac{3}{4}\) *Câu này bạn tự sử dụng gạch nhé!
`1,`
`a,`
`7/19 \times 8/23 + 7/19 \times 15/23 + 1 7/19`
`= 7/19 \times 8/23 + 7/19 \times 15/23 + 1 + 7/19`
`= 7/19 \times (8/23 + 15/23 + 1) + 1`
`= 7/19 \times 2 + 1`
`=14/19 + 1`
`= 33/19`
`b,`
`75/100 + 18/21 + 49/32 + 1/4 + 3/21 - 17/32`
`= 75/100 + (18/21 + 3/21) + (49/32 - 17/32) + 1/4`
`= 0,75 + 1 + 1 + 0,25`
`= (0,75 + 0,25) + 1 + 1`
`= 1+1+1=3`
`c,`
`8/9 \times 15/16 \times 24/25 \times 35/36 \times 48/49 \times 63/64`
`=` \(\dfrac{2\times3}{3\times3}\times\dfrac{3\times5}{4\times4}\times\dfrac{3\times4\times2}{5\times5}\times\dfrac{5\times7}{6\times6}\times\dfrac{6\times8}{7\times7}\times\dfrac{7\times9}{8\times8}\)
`= 3/4` (bạn sử dụng gạch, rút gọn các số là được nhé).
a, = ( 12 + 28 ) + ( 37 + 13 ) = 40 + 50 = 90
b, = [(-17) + (-33)] +[(-35) + 25] = - 50 - 10 = -60
a) 12 + 37 + 28 + 13
= ( 12 + 28 ) + ( 37 + 13)
= 40 + 40
= 80
Tick mik nha