Bn tham khảo nhé
Giải thích các bước giải:
1.a.5.22+(x+3)=52
110+(x+3)=52
113+x =52
x =52-113
x =-61
b.23+(x-32)=53-43
-9+x =10
x =10--9
x =19
c.4.(x-5)-23=24.3
4x =20-23
4x =72
4x =72+20+23
4x =115
x =115:4
x =115/4
d.5(x+7)−10=23×5
5x+25 =115
5 x =90
x=18
k.−4(2x+9)−(−8x+3)−(x+13)=0
x+52=0
x=−52
e.72-7.(13-x)=14
72-91+x =14
-19+x =14
x =14+19
x =33
i.26+(5+x)=34
26+5+x =34
31+x =34
x=34-31
x=3
f.5 x − 52 = 10
5x=10+52
5x=62
x = 62 phần 5
g.9x-2.32=34
9x-64 = 34
9x =34+64
x =98
x =98/9
h.10x+22.5=102
10x+110 =102
10x = 102-101
10x =-8
x =-8/10=-4/5
2.
a. 27.75+25.27-150=27.(75+25)-150
= 27.100-150
= 2700-150
= 2550
b.142-[50-(23.10-23.5)]
=142-[50-23(10-5)]
= 142-[50-23.5]
= 142-[50-115]
= 142-(-65)
= 207
c. 375:{32-[4+(5.32-42)]}-14
=375:{32-[4+(160-42)]}-14
= 375:[32-[4+118]}-14
= 375:{32-122}-14
=375:(-90)-14
=−256−256 -14
=−1096−1096
d. {210:[16+3(6+3.22)]}-3
={210:[16+3(6+66)]}-3
= {210:[16+3.72]}-3
= {210:[16+216]}-3
={210:232}-3
= 105116105116-3
= −243116−243116
e. 500-{5[409-(2³.3-21)²]-1724}
=500-{5[409-(24-21)²]-1724}
= 500-{5[409-3²]-1724}
= 500-{5.400-1724}
= 500-{2000-1724}
= 500-276
= 224
3.
a. (37-7)(-9)+(-17-13).21
=30.(-9)+(-30).21
= 30.(-9)+30.(-21)
= 30[-9+(-21)]
= 30.(-30)
= -900
b. -57(75-36)-75(36-57)
=-57.75-(-57).36-75.36+75.57
= (-57.75+75.57)-[(-57).36+75.36]
= (-57+57)75-(-57+75)36
= 0.75-18.36
= 0-648
= -648
c. 2.(-25).(-4).50
=(2.50).[(-25).(-4)]
= 100.100
= 10000
d. 16.50.(-25).(-250)
=(-4).(-4).50.(-25).(-250)
=[(-4).(-25)].[(-4).(-250)].50
= 100.1000.50
= 100000.50
= 5000000
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