54+(-20)+(-54)+70=?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 72 + 20 = 92
68 – 40 = 28
350 + 30= 380
970 – 70 = 900
b) 411 + 300 = 7811
625 + 200 = 825
954 – 400 = 554
367 – 300 =67
c) 32 + 7 + 8 = (32+8)+7=40+7=47
54 + 7 + 3 = 54 + (7+3)= 54+10=64
1 + 16 + 9 = (1+9)+16=10+16=26
96 + 40 + 4 = (96+4)+40=100+40=140
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-37+54+\left(-70\right)+\left(-163\right)+246\\ =-37+54-70-163+246\\ =\left(-37-163\right)+\left(54+246\right)-70\\ =-200+300-70\\ =100-70\\ =30.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-420-{-50+[-70+65-(54-49)]}
=-420-{-50+[-70+65-54+49]}
=-420-(-50-70+65-54+49)
=-420+50+70-65+54-49
=-360
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 172 + 10 x 2 = 170 +20 = 192
b) 10 x 2 + 300 = 20 + 300 = 320
c) 69 – 54 : 6 = 69 – 9 = 60
d) 900 + 9 x 10 = 900 +90 = 990
e) 20 x 6 + 70 = 120 + 70 = 190
f) 72 + 300 x 3 = 72 + 900 = 972
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
45 + 3 < 50 | 54 – 2 < 54 + 2 |
45 + 30 = 35 + 40 | 54 – 20 > 52 – 40 |
45 + 34 = 34 + 45 | 54 – 24 > 45 – 24 |
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(D=-37+54+\left(-70\right)+\left(-163\right)+256\)
\(D=-37+54-70-163+256\)
\(D=-\left(37+163\right)+\left(54+256\right)\)
\(D=-200+300\)
\(D=100\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-37 + 54 + (-70) + (-163 ) + 246
= [ (-37) + (-163) ] + ( 54 + 246 ) + (-70)
= -200 + 300 + (-70)
= 100 + (-70)
= 30
dap an cua Den do
54+ (-20) + (-54) + 70
= [54 + (-54)] + (-20 + 70)
= 0 + 50
= 50
=54+(-54)+(-20)+70
=0+50
=50