Tính
a.410 x 815
b.415 x 530
c. 2716 x 910
d. 723 x 542
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`#3107.101107`
A.
`-7 + x = -3`
`=> x = -3 - (-7)`
`=> x = -3 + 7`
`=> x = 4`
Vậy, `x = 4`
B.
`-456 - x = 723`
`=> x = -456 - 723`
`=> x = -1179`
Vậy, `x = -1179`
C.
`-124-312 + x = -415`
`=> -436 + x = -415`
`=> x = -415 - (-436)`
`=> x = -415 + 436`
`=> x = 21`
Vậy, `x = 21`
D.
`-214+512-(-163)-x=-768- (-423)`
`=> 298 - (-163) - x = -345`
`=> 298 + 163 - x = -345`
`=> 461 - x = -345`
`=> x = 461 - (-345)`
`=> x = 461 + 345`
`=> x = 806`
Vậy, `x= 806.`
a: x-7=-3
=>x=-3+7=4
b: -456-x=723
=>x=-456-723=-1179
c: -124-312+x=-415
=>x-436=-415
=>x=21
d: -214+512-(-163)-x=-768-(-423)
=>461-x=-345
=>x=461+345=806
a) 542 x 7 + 542 x 2 + 542
= 542 x 7 + 542 x 2 + 542 x 1
= 542 x (7 + 2 + 1)
= 542 x 10
= 5420
b) (126 x 35 + 157 x 55) x (132 - 6 x 22)
= (126 x 35 + 157 x 55) x (132 - 132)
= (126 x 35 + 157 x 55) x 0 (Số bất kỳ nào nhân với 0 vẫn = 0)
= 0
c) 897 x 99 + 897
= 897 x 99 + 897 x 1
= 897 x (99 + 1)
= 897 x 100
= 89700
a) \(542.7+542.2+542\)
\(=542.\left(2+7+1\right)\)
\(=542.10=5420\)
b) \(\left(126.35+157.55\right).\left(132-6.22\right)\)
\(=13045.0=0\)
c) \(897.99+897\)
\(=897.\left(99+1\right)\)
\(=897.100=89700\)
a: \(542\cdot7+542\cdot2+542\)
\(=542\left(7+2+1\right)\)
\(=542\cdot10=5420\)
b: \(\left(126\cdot35+157\cdot55\right)\cdot\left(132-6\cdot22\right)\)
\(=\left(126\cdot35+157\cdot55\right)\left(132-132\right)\)
\(=0\cdot\left(126\cdot35+157\cdot55\right)\)
=0
c: \(897\cdot99+897\)
\(=897\left(99+1\right)\)
\(=897\cdot100=89700\)
\(a.415\times7-415\times5+415\times8\)
\(=415\times\left(7-5+8\right)=415\times10=4150\)
\(b.23\times87+12\times23+23\)
\(=23\times\left(87+12+1\right)=23\times100=2300\)
a. 415 x 7 - 415 x 5 + 4 15 x 8
= 415 x ( 7 - 5 + 8 )
= 415 x 10
= 41 50
b. 23 x 87 + 1 2 x 23 + 2 3
= 23x 87 + 12 x 23 + 23 x 1
= 23 x ( 87 + 12 + 1 )
= 23 x 100
= 2300
=
a) 415 x 7 - 415 x 5 + 415 x 8
= 415 x (7 - 5 + 8)
= 415 x 10
= 4150
b) 23 x 87 + 12 x 23 + 23
= 23 x 87 + 12 x 23 + 23 x 1
= 23 x (87 + 12 + 1)
= 23 x 100
= 2300
x=2 đấy chính xác 100000000000000000000000000000000000000000000000% luôn
a, | x + 3 | - 12 = | -5 |
x + 3 - 12 = 5
x + 3 = 5 + 12
x + 3 = 17
x = 17 - 3 = 14
b, 25 - ( x- 5 ) = 415 x ( 15 - 415 )
25 - ( x - 5 ) = 415 x ( - 400 )
25 - ( x - 5 ) = - 166000
x - 5 = 25 - ( - 166000)
x - 5 = 166025
x = 166025 + 5
x = 166030
CHÚC BẠN HỌC TỐT
a) 3x-17=x+3
3x-x=17+3
2x=20 =>x=10
b) |x-3|-12=|-5|
|x-3|=17
x-3=17 hoặc x-3=-17
nếu x-3=17 thì x=20
nếu x-3=-17 thì x=-14
c) 2,5-(x-5)=-415-(15-415)
2,5-(x-5)=-15
x-5=2,5+15
x-5=17,5 =>x=22,5
a ) \(4^{10}.8^{15}\)
\(=\left(2^2\right)^{10}.\left(2^3\right)^{15}\)
\(=2^{20}.2^{45}\)
\(=2^{65}\)
a)\(4^{10}.8^{15}=\left(2^2\right)^{10}.\left(2^3\right)^{15}=2^{2.10}.2^{3.15}=2^{20}.2^{45}=2^{65}\)
b)\(4^{15}.5^{30}=4^{15}.5^{2.15}=4^{15}.\left(5^2\right)^{15}=4^{15}.25^{15}=\left(4.25\right)^{15}=100^{15}\)
c)\(27^{16}.9^{10}=\left(3^3\right)^{16}.\left(3^2\right)^{10}=3^{3.16}.3^{2.10}=3^{48}.3^{20}=3^{68}\)
d)\(72^3.54^2=\left(8.9\right)^3.\left(27.2\right)^2=8^3.9^3.27^2.2^2=\left(2^3\right)^3.\left(3^2\right)^3.\left(3^3\right)^2.2^2=2^{3.3}.3^{2.3}.3^{3.2}.2^2\)
\(=2^9.3^6.3^6.2^2=2^{11}.3^{12}\)
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