34+6+14+66=?
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-5-9-11-24
=-14-11-24
=-25-24
=-49
-14-7-12-24
=-21-12-24
=-33-24
=-57
12+38-30-22
=50-30-22
=20-22
=-2
34+(-43)+66-55
=-9+66-55
=57-55
=2
-10-14-16+43
=-24-16+43
=-40+43
=3
4
1
62
31
321
3132132
3145461320...................22222222222222222222222223130
2222222222222222222222222222222222226
30.
3062+958*+96
33
.36+9.03693
.36363.
\(\text{Ta có : }\)\(\frac{25}{4.9}+\frac{25}{9.14}+\frac{25}{14.19}+......+\frac{25}{2004.2009}\)
\(=5.\left(\frac{5}{4.9}+\frac{5}{9.14}+\frac{5}{14.19}+......+\frac{5}{2004.2009}\right)\)
\(=5\left(\frac{1}{4}-\frac{1}{9}+\frac{1}{9}-\frac{1}{14}+......+\frac{1}{2004}-\frac{1}{2009}\right)\)
\(=5\left(\frac{1}{4}-\frac{1}{2009}\right)\)
\(=5.\frac{2005}{8036}=\frac{10025}{8036}\)
34.66 - 34.4 - 66.34 - 66.4
= ( 34.66 - 66.34) - ( 34.4 +66.4)
= 0 - 4.(34+66)
= -4.100
= -400
\(34.\left(66-4\right)-66.\left(34+4\right)\\ =34.66-34.4-66.34-66.4\\ =\left(34-34-4\right).66-34.4\\ =-4.66-34.4\\ =4.\left(-66\right)-34.4\\ =4.\left(-66-34\right)\\ =4.\left(-100\right)\\=-400\\ -264.\left(-400\right).264.40\\ =264.400.264.40\\ =264.4.100.264.4.10\\ =264.4.264.4.\left(100.10\right)\\ =\left(264.4\right)^2.1000\\ =1115136.1000=1115136000\)
Lời giải:
a. $(132\times 6-66\times 12)\times (132\times 6+66)$
$=(66\times 2\times 6-66\times 12)\times (132\times 6+66)$
$=(66\times 12-66\times 12)\times (132\times 6+66)$
$=0\times (132\times 6+66)=0$
b.
$100-99+98-97+96-95+...+4-3+2$
$=(100-99)+(98-97)+(96-95)+....+(4-3)+2$
$=1+1+1+....+1+2$
Số lần xuất hiện của 1 là: $[(100-3):1+1]:2=49$
Giá trị của tổng cần tính là: $1\times 49+2=51$
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
34 . ( 66 - 5 ) - 66 . ( 34 + 5 )
= 34 . 61 - 66 . 39
= 2074 - 2574
= - 500
34+6+14+66=(34+66)+(6+14)=100+20=120
34+6+14+66=120