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a) 37 x 38 - 19 x 74 + 1000
= 37x19x2-19x2x37+1000
= 19x2x(37-37)+1000
= 38+1000
= 1038
b) 0,48x500-2,4x40x2
= 0,48x5x100-2,4x40x2
= 2,4x2x50-2,4x2x40
= 2,4x2x(50-40)
= 4,8x10
= 48
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a)x:1.5=87.5-23.4
x:1.5=64.1
x=64.1*1.5
x=96.15
b)x:15.8-x:4.7=38.9
x;(15.8-4.7)=38.9
x:11.1=38.9
x=38.9*11.1
x=431.79
a) 87,5-X:1,5=23,4
X : 1,5= 87,5 - 23,4
X : 1,5= 64,1
X = 64,1 x 1,5
X = 96,15
b) X:15,8-X:4,7-X=38,9
X:15,8-X:4,7- X : 1=38,9
X : ( 15,8 - 4,7 - 1 ) = 38,9
X : 10,1 = 38,9
X = 38,9 x 10,1
X = 392,89
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x+100=200-500 x+800=1000
x+100=-300 x =1000-800
x =(-300)-100 x =200
x =(-300)+(-100)
x =-400
x+100=200-500
x+100=-300
x=-300+100
x=-200
x+800=1000
x=1000-800
x=200
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a, 1000 - 500 x 0,637 + 100,75 x 3,2
= 1000 - 318,5+ 322,4
= 861,5 + 322,4
= 1003,9
b, { 28,4 - 15,8 } x 4,66
= 12,6 x 4,66
= 58,716
/HT\
a. 1000 - 500 x 0,637 + 100,75 x 3,2
= 1000 - 318,5 + 322,4
= 681,5 + 322,4
=1003,9
b. { 28,4 - 15,8 } x 4,66
= 12,6 x 4,66
= 58 , 716
HT