1 x 34 x 24 =
4 x 35 x 35 =
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2 + 4 + 6 + 8 + .... + 24 có số số hạng là:
(24 - 2) : 2 + 1 = 12 (số)
tổng là :
(24 + 2) x 12 : 2 = 156
b) 35 x 24 + 35 x 76 +55 x 19 +55 x 91
= 35 x ( 24 + 76 ) + 55 x ( 19 + 91 )
= 35 x100 +55 x 100
= 100 x ( 55 + 35 )
= 90 x 100 =9 000
c) \(6\cdot25\cdot4+4\cdot19\cdot6-2\cdot14\cdot12\)
\(=24\cdot25+24\cdot19-24\cdot14\)
\(=24\left(25+19-14\right)\)
\(=24\cdot30=720\)
d) \(19\cdot64+76\cdot34\)
\(=76\cdot19+76\cdot34\)
\(=76\left(19+34\right)=76\cdot53=4028\)
a) 2 x 16 x 50 x 25
= ( 2 x 50 ) x ( 16 x 25 )
= 100 x 400
= 40 000
a) 320 x 63 - 16 x 20 + 32 x 370
= 320 x 63 - 320 x + 320 x 37
= 320 x ( 63 - 1 + 37 )
= 320 x 99
= 320 x ( 100 - 1 )
= 320 x 100 - 320
= 32000 - 320 = 31 680
b) 35 x 61 + 215 x 5 + 35 x 39 + 57 x 25
= 5 x 427 + 5 x 215 + 5 x 273 + 5 x 285
= 5 x ( 427 + 215 + 273 + 285 )
= 5 x 1200 = 6000
c) 34 x 24 - 94 x 6 + 83 x 48 - 47 x 88
= 204 x 4 - 4 x 141 + 996 x 4 - 1034 x 4
= 4 x ( 204 - 141 + 996 - 1034 )
= 4 x 25 = 100
a) (71+x)-(-24-x)+(-35-x)=0 b)x-34-[(15+x)-(23-x)]=0
71+x+24+x+-35-x =0 x-34-15-x-23+x =0
(x+x-x)+(71+24-35) =0 (x-x+x)+(-34-15-23) =0
x+60 =0 x+-72 =0
x =0-60 x =0-(-72)
x = -60 x = 72
3 x 125 x 8 + 4 x 24 x 35 + 4 x 35 x 2 x 12
= 375 x 8 + 96 x 35 + 140 x 24
= 3000 + 3360 + 3360
= 3000 + 3360 x 2
= 3000 + 6720
= 9720
mk chỉ làm ý A thui nha
\(A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)
\(A=71+x+24+x+\left(-35\right)-x\)
\(A=\left[71+24+\left(-35\right)\right]+\left(x+x-x\right)\)
\(A=60+x\)
Vậy \(A=60+x\)
\(a,A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)
\(=71+x+24+x-35-x\)
\(=60+x\)
\(b,B=x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)
\(=x-34-\left(15+x-23+x\right)\)
\(=x-34-15-x+23-x\)
\(=-x-26\)
4a) \(\frac{x}{36}=\frac{3}{4}\)
\(\Rightarrow\frac{x}{36}=\frac{27}{36}\)
\(\Rightarrow x=27\)
4b) 33 + x = 71 - 26
33 + x = 45
x = 45 - 33
x = 12
4c) x * (3,5 + 1,5) = 10
x * 5 = 10
x = 10 ; 5 = 2
4,
\(a,\frac{x}{36}=\frac{24}{32}\)
\(=>\frac{x}{36}=\frac{3}{4}=\frac{27}{36}\)
\(=>x=27\)
\(b,71-\left(33+x\right)=26\)
\(=>-\left(33+x\right)=26-71=-45\)
\(=>33+x=45\)
\(=>x=12\)
\(c,3,5\cdot x+1,5\cdot x=10\)
\(>x\cdot\left(3,5+1,5\right)=10\)
\(=>x\cdot5=10\)
\(=>x=2\)
. là nhân nha
a/ M = (71+x)-(-24+x)+(-35-x) = 71 + x + 24 - x - 35 - x = (71 + 24 - 35) - x = 95 - 35 - x = 60 - x
b/ N=x-34-[(15+x)-(23-x)] = x - 34 - (15 + x - 23 + x) = x - 34 - (-8 + 2x) = x - 34 + 8 - 2x = -26 - x
\(a,M=\left(71+x\right)-\left(-24+x\right)+\left(-35-x\right)\)
\(=71+x+24-x-35-x\)
\(=60-x\)
\(b,N=x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)
\(=x-34-\left(15+x-23+x\right)\)
\(=x-34-15-x+23-x\)
\(=-26-x\)
1 x 34 x 24 = 816
4 x 35 x 35 =4900
k mk nha
\(1x34x24=816\)
\(4x35x35=4900\) nha bạn