a) 670

b)33230

c)20373

d) 14000

a) 570

b)33230

c)20373

d)14000

17.85+25.17-1200

=17.(85+25)-1200

=17.110-1200

=1870-1200=670

745-5(120-74)-70

= 745-5.46-70

=745-230-70

=445

27.332+93.43+57.61+69.57

=8964+3999+57(61+69)

=12963+57.130

=12963+7410=20373

34.75+75.66-65.100

=75(34+66)-65.100

=75.100-65.100

=100(75-65)

=100.10= 1000.

                                                                  43.27+93.43+57.61+57.59

                                                                  =43.(27+93)+57.(61+59)

                                                                   =43.120+57.120

                                                                   =120.(43+57)

                                                                   =120.100

                                                                   =12000

43 . 27 + 93 . 43 + 57 . 61 + 57 . 59

= 43 . ( 27 + 93 ) + 57 . ( 61 + 59 )

= 43 . 120 + 57 . 120

= 120 . ( 43 + 57 )

= 120 . 100

= 12000

=1739+3999+3477+3933

=13148

Bài làm

1)43.37+93.43+57.61+69.57

= 43.(37+93) + 57.(61+69)

= 43.130       + 57.130

= 130.( 43+57 )

= 130.100

= 13000

2)27.332+68.27+73.332+68.73

= 27.(332+68) + 73.(332+68 )

= ( 332 + 68 ) . ( 27 + 73 )

= 400 . 100

= 40000

3)67.99

= 6633

4)998.34

= 33932

5)2.31.12+4.6.42+8.27.3

= 744 + 1008 + 648

= 2400

6)36.28+36.82+64.69+64.41

= 36.( 18 + 82 ) + 64.( 69 + 41 )

= 36 . 100 + 64 . 110

= 3600 + 7040

= 10640

# Học tốt #

1)  \(43.37+93.43+57.61+69.57\)

\(=\left(43.37+93.43\right)+\left(57.61+69.57\right)\)

\(=43\left(37+93\right)+57\left(61+69\right)\)

\(=43.130+57.130\)

\(=130\left(43+57\right)\)

\(=130.100\)

\(=13000\)

2) \(27.332+68.27+73.332+68.73\)

\(=\left(27.332+73.332\right)+\left(68.27+68.73\right)\)

\(=332\left(27+73\right)+68\left(27+73\right)\)

\(=332.100+68.100\)

\(=100\left(332+68\right)\)

\(43.27+93.43+57.61+59.57\)

\(=\left(43.27+93.43\right)+\left(57.61+59.57\right)\)

\(=43\left(27+93\right)+57\left(61+59\right)\)

\(=43.120+57.120\)

\(=120\left(43+57\right)\)

\(=120.100\)

\(=12000\)

Học tốt

43.27+93.43+57.61+59.57=43(27+93)+57(61+59)=43.120+57.120=120(43+57)=120.100=12000

Chúc bạn học tốt