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2-4+6-8+10-12+14-16+18-20+22
=(2+18)-(4+16)+(6+14)-(8+12)-(10+20)+22
=20-20+20-20-20+22
=22-20
=2
324 – 20 + 61 = 304 + 61 = 365
188 + 12 – 50 = 200 - 50 = 120
Tính giá trị của biểu thức:
a) 324 – 20 + 61 = 356
b) 21 x 3 : 9 = 7
c) 201 + 39 : 3 = 214
d) 123 x (42 - 38) = 528
a) 7.111-777=777-777=0
b) -2+(-2)+...+(-2)+22=(-2).5+22=-10+22=12
c) Số các số hạng là:(108-10):2+1=50
G.trị biểu thức trên là: (108+10).(50:2) = 118.25 = 2950
d) -1+(-1)+(-1)+...+(-1)+10+11+77
=(-1).5+98=(-5)+98+93
Nhớ tk cho mk nha!
a, ta có 7+7+7+7+...........+7(111 số 7)=7x 111=777
ta có 777-777=0
b,ta sẽ có;2-4=-2;6-8=-2;.........;18-20=-2+22
=(-2)+(-2) +(-2)+(-2)+(-2 )+22=(-10)+22
=12
c,10+12+14+16+....+108=(108+10)x[(108-10):+1):2=2950
d,95
= (70 - 60) + (61 - 51) + (50 - 40) + (41 - 31) + ( 30 - 20) + (21 - 11) + 10
= 10 +10 + 10 + 10 + 10 + 10 + 10.
= 20 + 20 + 20 + 10
= 40 + 30
= 70
= ( 60+40) +( 61-11 +50) + (51 + 70 -21) + ( 41 -31 +30 +10 +20)
= 100 + 100 + 100 + 70
= 370
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21=231
trả lời:
=231
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(1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20)*(21*4+6-84)=330
\(324-20+61=365\)
\(188+12-50=150\)
\(21+21+21:9=7\)
\(40:2.6=120\)