42.120-43.17+42.34
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a: \(42\cdot102-43\cdot17-42\cdot34\)
\(=42\left(102-34\right)-43\cdot17\)
\(=168\cdot17-42\cdot17\)
\(=17\cdot126=2142\)
c: \(3\cdot42-22\cdot3=3\cdot20=60\)
\(43.17+29.57+13.43+57\\ =43.\left(17+13\right)+57.\left(29+1\right)\\ =43.30+57.30\\ =30.\left(43+57\right)\\ =30.100\\ =3000\)
chúc bạn học tốt !!!
43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000
43.17+29.57+13.43+57
=43.17+29.57+13.43+57.1
=43.(17+13)+57.(29+1)
=43.30+57.30
=30.(43+57)
=30.100
=3000
\(43.17+29.54+13.43+54\)
\(=43.\left(17+13\right)+54.\left(29+1\right)\)
\(=43.30+54.30\)
\(=30.\left(43+54\right)\)
\(=30.97\)
\(=2910\)
b) 25 . 73 + 100 . 4 + 73 . 75
= 73 . ( 25 + 75 ) + 100 . 4
= 73 . 100 + 100 . 4
= 100 . ( 73 + 4 )
= 100 . 77
= 7700
c) ( x - 34 ) . 15 = 0
=> x - 34 = 0 : 15
=> x - 34 = 0
=> x = 0 + 34
=> x = 34
d) 18 . ( x - 16 ) = 18
=> x - 16 = 18 : 18
=> x - 16 = 1
=> x = 1 + 16
=> x = 17
\(43\cdot17+29\cdot57+13\cdot43+57\)
\(=43\cdot\left(17+13\right)+57\cdot\left(29+1\right)\)
\(=43\cdot30+57\cdot30\)
\(=30\cdot\left(43+57\right)\)
\(=30\cdot100\)
\(=3000\)
43.17+29.57+13.43+57
=43.17+29.57+13.43+57.1
=43.(17+13)+57.(29+1)
=43.30+57.30
=30.(43+57)
=30.100
=3000
a) 24 +117 + 115 + 176 + 83
=(24+176)+(117+83)+115
= 200+200+115
=515
b) 17.57 + 43.17 + 29
=17.(57+43)+29
=17.100+29
=1700+29
=1729
c) 47.164 + 164.53 + 5 . 43
=164.(47+53)+5.64
=164.100+320
=16400+320
=16720
d)194.12 + 6.437.2 + 3.369.4
=194.12 + 437.12 + 369.12
=12.(194+437+369)
=12.1000
=12000
a) 432 + 43.17 = 43.(43 + 17) = 43.60 chia hết cho 60
b) 275 - 311 = 315 - 311 = 311.(34 - 1) = 311.80 chia hết cho 80
42.120-43.17+42.34
=42.120-42.68+42.34
=42.(120-68+34)
=42.86
=16.86
=1376
\(4^2\cdot120-4^3\cdot17+4^2\cdot34\\ =4^2\cdot\left(120-4\cdot17+34\right)\\ =16\cdot\left(120-34\right)\\ =16\cdot86\\ =1376\)