ngu

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{36}\\{36}\end{array}}\\\hline{\,\,\,\,72}\end{array}\)                                       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{73}\\{17}\end{array}}\\\hline{\,\,\,90}\end{array}\)

\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{28}\\{53}\end{array}}\\\hline{\,\,\,81}\end{array}\)                                       \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{25}\\{35}\end{array}}\\\hline{\,\,\,60}\end{array}\)

[35+65]+[89+11]+[34+66]+[27+73]+[51+49]+[9+91]

=10+10+10+10+10+10=60 dễ mà

35+89+65+34+11+66+27+73+51+09+91+49

=[35+65]+[89+11]+[34+66]+[27+73]+[51+49]+[09+91]

=100+100+100+100+100+100

=100x6

=600

35+89+65+34+11+66+27+73+51+09+91+49

= 35+65+89+11+34+66+27+73+51+49+09+91

= 100 + 100 + 100 + 100 + 100 + 100

= 600

1: =66+34-73-27+99=99

2: =54-45+30-54-30+5=-40

3: =42-56+33-33+56-42=0

4: =50-47-50+18+47-18=0

5: =10-28+30-4=2-4+10=12-4=8

\(\text{1.-(-66)+34+(-73)-27+99}.\)

\(=66+34-73-27+99=100-100+99=-99.\)

\(\text{2.54-(45-30+54)-30+5}.\)

\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)

\(\text{3.42-56+33-(33-56+42)}.\)

\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)

\(\text{4.50-(47+50-18)+(47-18)}.\)

\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)

\(\text{5.10-(28-30+4)}.\)

\(=10-28+30-4=10+30-20-8-4=20-12=8.\)

\(\text{6.-(-73)+(44-94+27)+94}.\)

\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)

ez

139

139 

66 x 74 + 34 x 66 + 66 36 + 34 x64

= 66 x ( 74 + 34 +36 +64 )

= 66 x 208

= 13728

học tốt

66.74+34.66+66.36+34.64

=66 (74+34+36+34)

=13728

TL

66 x 74 + 34 x 66 + 66 x 36 + 34 x 64 

= (66 x ( 74 + 36))+(34 x ( 64 + 66))

=(66 x 110)+(34 x 130)

= 7260 + 4420

= 11680

* Excuse me, k cho mình nha cực hợp lí 

24 × 66 - 24 + 36 × 24

= 24 × (66 - 1 + 36)

= 24 × 101

= 24 × (100 + 1)

= 24 × 100 + 24

= 2400 + 24

= 2424

\(..=24x\left(66-1+36\right)=24.\left(65+35+1\right)=24.\left(100+1\right)=2400+24=2424\)

\(24\times66-24+36\times24=24\times\left(66-1+36\right)\)

                                      \(=24\times101\) 

                                       \(=2424\)

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) \(66.25+5.66+66.14+33.94\)

\(=33\left(2.50+5.2+14.2+94\right)\)

\(=33\left(50+10+28+94\right)\)

\(=33.182\)

\(=6006.\)

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