Giúp mình với mai phải nộp rồiiiiiiiiiiii
b 57 x 78 + 42 x 78 + 78
c 1634 x 45 - 45 x 633 - 45
d 368 x 85 - 368 + 368 x 16
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a) \(39\times118+29\times82\)
\(=39\times2\times59+29\times2\times41\)
\(=2\times\left(39\times59+29\times41\right)\)
\(=2\times\left(2301+1189\right)\)
\(=2\times3490\)
\(=6980\)
b) \(37\times39+78\times14-13\times85-52\times55\)
\(=37\times3\times13+6\times13\times14+13\times85-4\times13\times55\)
\(=13\times\left(37\times3+6\times14+85-4\times55\right)\)
\(=13\times\left(111+84+85-220\right)\)
\(=13\times\left(280-220\right)\)
\(=13\times60\)
\(=780\)
c) \(368:16+752:16+480:16\)
\(=\left(368+752+480\right):16\)
\(=\left(1120+480\right):16\)
\(=1600:16\)
\(=100\)
d) \(5\times11\times18+9\times31\times10+4\times29\times45\)
\(=5\times11\times9\times2+9\times31\times10+2\times2\times29\times5\times9\)
\(=10\times9\times11+10\times9\times31+10\times29\times2\times9\)
\(=90\times11+90\times31+90\times29\times2\)
\(=90\times\left(11+31+29\times2\right)\)
\(=90\times\left(42+58\right)\)
\(=90\times100\)
\(=9000\)
a)
2 9 − 7 8 . x = 1 3 7 8 . x = 2 9 − 1 3 7 8 . x = − 1 3 x = − 1 3 : 7 8 x = − 8 21
b)
4 5 + 5 7 : x = 1 6 5 7 : x = 1 6 − 4 5 5 7 : x = − 19 30 x = 5 7 : − 19 30 x = − 150 133
C1:
a) 135 x 54 + 45 x 135 + 135
= 135 x ( 54 + 45 + 1)
=135x100=13500
C2
a) 135 x 54 + 45 x 135 + 135
= 7290 + 6075 +135
= 13500
a ) x = − 91 60 . b ) x = − 8 9 . c ) x = 35 19 . d ) x = 3 7 .
\(a.13.\left(78+22\right)=13.100=1300\)
\(b.25.70+28.25+25.2=25.\left(70+28+2\right)=25.100=2500\)
\(c.\dfrac{15.3.14.2.19}{19.14.15}=6\)
\(d.\dfrac{132.70.60}{12.35.20}=\dfrac{11.12.35.2.20.3}{12.35.20}=66\)
x-23=78 67-x=45 x+345=678
x =78+23 x =67-45 x =678-345
x =101 x =22 x =333
5 x 6 = 30
78 x 57 = 4446
45 x 34 = 1530
32 x 19 = 608
k cho mk nha
3:
a: -5x-16=-46
=>-5x=-46+16=-30
=>5x=30
=>\(x=\dfrac{30}{5}=6\)
b: -80-(-16-x)=20
=>\(-x-16=-80-20=-100\)
=>x+16=100
=>x=100-16=84
2:
a: \(\left(45-3456\right)+3456\)
\(=45+3456-3456\)
=45
b: \(\left(77+22-75\right)-\left(-25-78-13\right)\)
\(=77+13+22+78-75+25\)
\(=90+100-50\)
=140
c: \(-25\cdot63-25\cdot37\)
\(=-25\left(63+37\right)\)
\(=-25\cdot100=-2500\)
b: \(57\cdot78+42\cdot78+78\)
\(=78\left(57+42+1\right)\)
\(=78\cdot100=7800\)
c: \(1634\cdot45-45\cdot633-45\)
\(=45\cdot\left(1634-633-1\right)\)
\(=45\cdot1000=45000\)
d: \(368\cdot85-368+368\cdot16\)
\(=368\cdot\left(85-1+16\right)\)
\(=368\cdot100=36800\)
b,78 x ( 57 + 42 + 1 )
= 78 x 100
= 7800
c,45 x ( 1634 - 633 - 1)
= 45 x 1000
= 45000
d,368 x ( 85 - 1 + 16 )
= 368 x 100
= 36800
Đây nha bạn!