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Bổ sung bài : Tính nhanh
\(46.57-38.73+57.54-73.62\)
\(=\left(46.57+57.54\right)-\left(38.73+73.62\right)\)
\(=57\left(46+54\right)-73\left(38+62\right)\)
\(=57.100-73.100\)
\(=5700-7300=-1600\)
46 x 57 -38x73+57x54-73x62
=57x(46+54)-73x(38+62)
=57x100-73x100
=100(57-73)
=100x (-16)
=-1600
1/13.58.4+32.26.2+52.10
=52.58+52.32+52.10
=52(58+32+10)=52.100=5200
2/15.37.4+120.21+21.5.12
=60.37+120.21+60.21
=60(37+2.21+21)=60.100=6000
86.24+24.34+120.76
=(86+34).24+120.76
=120.24+120.76
=120.(24+76)
=120.100
=12000
Bài làm
71 - (33 + x) = 26
(33+x)=71-26
33+x = 45
x = 45-33
x = 12
Vậy x=12
(x + 73) - 26 = 76
(x + 73 ) = 76+26
x + 73 = 102
x = 102 - 73
x = 29
Vậy x=29
45 - (x + 9) = 6
(x + 9) = 45-6
x + 9 = 39
x = 39-9
x = 30
Vậy x=30
# Chúc bạn học tốt #
71-(33+x)=26
33+x=71-26
33+x=45
x=45-33
x=12
(x+73)-26=76
x+73=76+26
x+73=102
x=102-73
x=29
45-(x+6)=9
x+6=45-9
x+6=36
x=36-6
x=30
1, <=>33+x=45
<=> x = 12
Vậy x=12
2, <=>x+73 =102
<=> x =29
3,x=2
4, -23+x=25<=>x=2
6, x-8=20<=>x=28
32 . 41+ 46.73 + 32.59 +73.54
=32.(41+59)+73.(46+54)
=32.100+73.100
=100.(32+73)
=100.105 = 10500
32*41+46*73+32*59+73*54
=(32*(41+59))+(73*(54+46))
=(32*100)+(73*100)
=3200+7300
=11500 k cho minh nha thuuuuuuuuuuu
a, 568 + 568 x 135 - 568 x 36
= 568 x ( 1 + 135 - 36)
= 568 x 100
56 800
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51)
= 54 x 100
= 5 400
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= ( 2 x 35) x ( 7 x 5) + ( 10 x 7) x 25 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x ( 35 + 25 + 20)
= 70 x 80
= 5 600
a) 568 + 568 x 135 - 568 x 36
= 568 x ( 1+1+135-1-36 )
=568 x 100
=5680
b) 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37 ) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51 )
= 54 x 100
= 5400
c) 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= 70 x 35 + 10 x 25 x 7+ 20 x 70
= 70 x 35 + 250 x 7 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x (35+25+20)
= 70 x 80
= 5600
26 x 54 + 52 x 73
26 x 54+52x73=26x54+26x2x73=26x(54+146)=26x200=5200