Toán Lớp 6: Bài 3 : Tính 1 cách hợp lý A) 84+46+116+54+375 B) 523+347+177+253-680 C) 36.2021.5mũ2

Question

Toán Lớp 6:  Bài 3 : Tính 1 cách hợp lý A) 84+46+116+54+375 B) 523+347+177+253-680 C) 36.2021.5mũ2

ngoclanhoa · Answer

a,   84+46+116+54+375     = ( 84+  116 ) + ( 46 + 54 )+375    = 200 + 100 + 375     = 300 + 375     = 675     b,    523+347+177+253-680     = 523+ 177 ) + ( 347 + 253 ) - 680      = 700 + 600 - 680     = 1300 - 680     = 620     c,     36 . 2021 . 5&sup2;      = 36 . 2021 . 25      = ( 35 . 25 ) . 2021     = 900 .2021     =1818900

hauthanhyen98 · Answer

a) 84 + 46 + 116 + 54 + 375   =  (84 + 116) + (46 + 54) + 375   = 200 + 100 + 375   = 300 + 375   = 675   ___________________________________   b) 523 + 347 + 177 + 253 - 680   = (523 + 177) + (347 + 253) - 680   = 700 + 600 - 680   = 1300 - 680   = 620   __________________________________   c) 36 . 2021 . 5^2   = 36 . 2021 . 25   = (36 . 25) . 2021   = 900 . 2021   = 1818900