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a,
= 4.3.25.8
= (4.25).3.8
= 100.24
= 2400
b,
= 7.25.3.3.4
= (25.4).7.3.3
= 100.63
= 6300
d,
= (93-13):16
= 80:16
=5
e,
= 53+51-53+49
= (53-53)+(51+49)
= 0+100
= 100
f,
= 168-49-68+4
= (168-68)+4-49
= 0+4-49
= -45
g,
= 53+7-53-49
= (53-53)+7-49
= 0+7-49
-42
h,
= (-25).124+124.25
= 124.(25-25)
= 124.0
= 0
i,
= 11.(-36)-64.11
= 11.(-36-64)
= 11.(-100)
= -1100
k,
= 125.(24-24)
= 125.0
= 0
l,
= (-125).23+23.225
= 23.(225-125)
= 23.100
= 2300
m,
= (-11).(36+64)
= (-11).100
= -1100
a) (-4).(-3).25.(-8)
= (-4.25).[(-3).(-8)]
=-100.24
=-2400
b) 7.(– 25).(– 3)2.(– 4)
= 7.(-25).9.(-4)
=(7.9).[(-25).(-4)]
=63.100
=6300
d)[ 93–( 20–7 )]:16
= [ 93 - 13]:16
= 80 : 16
= 5
e) 53 – (–51) + (-53) + 49
= 53 + 51 + (-53) + 49
= [53+(-53)] + (51+49)
=0 + 100
=100
f) 168 – (49) + (-68) + 4
= [168+(-68)] + 4 - 49
= 100 + 4 - 49
= 104 - 49
= 55
g) 53 – (–7) + (-53) – 49
= 53 + 7 - 53 - 49
= (53 - 53) + (7 - 49)
= 0 + ( - 42)
= -42
h) 25.(- 124) + 124. 25
= 25.(-124+124)
= 25.0
=0
i) (-11).36 - 64.11
= 11.(-36-64)
= 11.(-100)
= -1100
k) 125.(- 24) + 24.125
=125.(-24+24)
=125.0
=0
l) 125.(-23) + 23.225
=23.(-125+225)
=23.100
=2300
m) (-11).36 + 64.(- 11)
=(-11).(36+64)
=-11.100
=-1100
\(a,\left(-4\right).\left(-3\right).25.\left(-8\right)\)
\(=12.25.\left(-8\right)\)
\(=12.\left(-200\right)\)
\(=-2400\)
\(b,7.\left(-25\right).\left(-3\right)^2.\left(-4\right)\)
\(=7.\left(-3\right)^2.100\)
\(=7.9.100=63.100\)
\(=6300\)
\(d,\left[93-\left(20-7\right)\right]:16\)
\(=\left[93-13\right]:16\)
\(=80:16=5\)
\(e,51-\left(-51\right)+\left(-53\right)+49\)
\(=51.2-53+49=102-53+49\)
\(=49.2=98\)
\(f,168-49+\left(-68\right)+4\)
\(=168-68-49+4=100-45=55\)
\(g,53-\left(-7\right)+\left(-53\right)-49\)
\(=53+7-53-49\)
\(=7-49=-42\)
\(h,25.\left(-124\right)+124.25\)
\(=25.\left(-124+124\right)\)
\(=25.0=0\)
\(i,\left(-11\right).36-64.11\)
\(=11.\left(-36\right)+\left(-64\right).11\)
\(=11.\left(-36-64\right)=11.\left(-100\right)\)
\(=-1100\)
\(k,125.\left(-24\right)+24.125\)
\(=125.\left(-24+24\right)=125.0=0\)
\(l,125.\left(-23\right)+23.\left(225\right)\)
\(=-125.23+23.225\)
\(=23.\left(-125+225\right)=23.100=2300\)
\(m,-11.36+64.\left(-11\right)\)
\(=-11.\left(36+64\right)=-11.100=-1100\)
a) \(\left(-4\right)\left(-3\right)\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right]\left(-3\right)\)
\(=\left(-100\right).1000.\left(-3\right)=300.1000=300000\)
b) \(\left(-4\right).9\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right].9\)
\(=\left(-100\right).1000.9=\left(-100\right).9000=-900000\)
c) \(7.\left(-25\right)\left(-3\right).2.\left(-4\right)=\left[\left(-25\right)\left(-4\right)\left(-3\right)\right].7.2=-4200\)
d) \(\left[93-\left(20-7\right)\right]\div16=\left(93-13\right)\div16=80\div16=5\)
e) \(53-\left(-51\right)+\left(-53\right)+49=\left(53-53\right)+\left(51+49\right)=100\)
f) \(168-49+\left(-68\right)+4=168-49-68+4=55\)
1. 11 x 18 = 11 x 9 x 2 = 6 x 3 x 11;
15 x 45 = 45 x 3 x 5 = 9 x 5 x 15.
2. 17 x 4 = 17 x 2 x 2= 34 x 2 = 68;
25 x 28 = 25 x 4 x 7 = 100 x 7 = 700
3. 13 x 12 = 13 x (10+2)= 13 x 10 + 13 x 2=130 + 26 = 156
53 x 11 = 53 x (10+1) = 53 x 10 + 53 x 1= 530 + 53 = 583
39 x 101 = 39 x (100+1)=39 x 100 + 39 x 1 = 3900 + 39 = 3939
4. 8 x 19 = 8 x (20-1) = 8 x 20 - 8x1= 160 - 8 =152
65 x 98 = 65 x (100-2)= 65 x 100 - 65 x 2 = 6500 - 130 =6370.
mọi người giúp bn ấy đê
mk lười gõ
mk lười tính
mk lười lắm
lười thì chết thôi
ko ai rảnh tay trả lời đâu
tự túc là hạnh phúc bn ạ
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