11 + 12 99+53 76 - 76 12+1234 768 + 178 768 + 123 432 - 123 11-10
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a) \(3119\cdot121-3119\cdot11\cdot11\)
\(=3119\cdot121-3119\cdot\left(11\cdot11\right)\)
\(=3119\cdot121-3119\cdot121\)
\(=3119\left(121-121\right)\)
\(=0\)
b) \(24\cdot\left(123\cdot87\right)+\left(87\cdot123\right)\cdot76\)
\(=\left(123\cdot87\right)\cdot\left(76+24\right)\)
\(=\left(123\cdot87\right)\cdot100\)
\(=1070100\)
a: =6/35x39/54=13/105
b: \(=\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{12}{7}=\dfrac{-5}{7}+\dfrac{12}{7}=1\)
99 = 76 + 90 = 166
768+90 x6 = 5148
1=1
Ta có: (12*4)+(123*4)+............+(1234567*4)
Có 6 số * với 4
Vậy cách giải là :
(12+123+1234+12345+123456+1234567)*4=5486948
=4.12+4.123+4.1234+4.12345+4.123456+4.1234567=4(12+123+1234+12345+123456+1234567)=4.1371737
=5485948
B1 :
a, = -2-2-2= -6
b, = -2-2-2 = -6
B2:a, = 768-39-768 = (768-768)-39=0-39=-39
b, = -1579-12+1579 = (-1579+1579)-12 = 0-12=-12
k mk nha
a) \(\dfrac{122}{123}\) và \(\dfrac{10}{11}\)
\(1-\dfrac{122}{123}=\dfrac{1}{123}\)
\(1-\dfrac{10}{11}=\dfrac{1}{11}\)
Vì \(\dfrac{1}{123}< \dfrac{1}{11}\) nên ⇒ \(\dfrac{122}{123}< \dfrac{10}{11}\)
b) \(\dfrac{16}{12}\) và \(\dfrac{99}{100}\)
\(\dfrac{16}{12}>1\) và \(\dfrac{99}{100}< 1\)
⇒ \(\dfrac{16}{12}>\dfrac{99}{100}\)
c) \(\dfrac{35}{70}\) và \(\dfrac{6}{11}\)
\(\dfrac{35}{70}=\dfrac{1}{2}\) = \(\dfrac{6}{12}\)
Vì \(\dfrac{6}{12}< \dfrac{6}{11}\) nên ⇒ \(\dfrac{35}{70}< \dfrac{6}{11}\)
a. -37 + 54 + -70+ -163 + 246
= ( 54 + 246) + (-37 - 163 ) - 70
= 300 -200 - 70 = 30
b. -359+ 181+ -123+ 350+ -172
=(-178)+227+(-172)
=49+(-172)
=-123
c.-69+ 53+ 46+ -94+-14+ 78
=(-16)+(-48)+64
=-64+64
=0
d. 13- 12+ 11+10- 9+ 8- 7- 6+ 5- 4+ 3+2- 1
= 13 - (13 - 1) + (13 - 2) + (13 - 3) - (13 - 4) + (13 - 5) - (13 - 6) - (13 - 7) + (13 - 8) - (13 - 9) + (13 - 10) + (13 - 11) - (13 - 12)
= 13 - 13 + 1 + 13 - 2 + 13 - 3 - 13 + 4 + 13 - 5 - 13 + 6 - 13 + 7 + 13 - 8 - 13 + 9 + 13 - 10 + 13 - 11 - 13 + 12
= (13 - 13 + 13 + 13 - 13 + 13 - 13 - 13 + 13 - 13 + 13 + 13 - 13) + (1 - 2 - 3 + 4 - 5 + 6 + 7 - 8 + 9 - 10 - 11 = 12)
= 13 + 0
= 13
a) \(-37+54+\left(-70\right)+\left(-163\right)+246\)
\(=\left(246+54\right)-\left(37+163\right)-70\)
\(=300-200-70\)
\(=100-70=30\)
b) \(-359+181+\left(-123\right)+350+\left(-172\right)\)
\(=-359+181-123+350-172\)
\(=\left(-359+350\right)+\left(181-172\right)-123\)
\(=-9+9-123\)
\(=-123\)
c) \(-69+53+46+\left(-94\right)+\left(-14\right)+78\)
\(=-69+53+46-94-14+78\)
\(=\left(-69+78\right)+\left(53-14\right)+\left(46-94\right)\)
\(=9+39-48\)
\(=48-48=0\)
d) \(13-12+11+10-9+8-7-6+5-4+3+2-1\)
\(=\left(13-12\right)+\left(11+10\right)-\left(9-8\right)-\left(7+6\right)+\left(5-4\right)+\left(3+2-1\right)\)
\(=1+21-1-13+1+5\)
\(=21-13+1+5\)
\(=8+1+5=9+5=14\)
Tk mk nha!!!!!!!
11+12=23
99+53=152
76-76=0
12+1234=1246
768+178=946
768+123=891
432-123=309
11-10=1