Question

Bài 1: Đặt tính rồi tínha. 352 647 + 419 172    837 161 + 75 934                           379 454 – 126 798..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................     b. 1798 x 45                            576 x 79                                 345 x 87  ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   Bài 2: Tính bằng cách thuận tiện nhấta. 1255 +436 +145b. 142 x 12 +142 x 18c. 4 x 18 x 25..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................   ..............................................................................................................................       Bài 3: > < =

41m2 19dm2 … 409dm230m2 6dm2 … 3060dm25dm2 9cm2 … 509cm2300m2 6dm2 … 3006dm2

90 000cm2 … 90m28012cm2 … 8dm2 12cm23940dm2 … 39m2 40dm22009cm2 … 21dm2

Answer 1

Bài 2:

a: \(=1255+145+436=1400+436=1836\)

b: =142(12+18)=142*30=4260

c: =4*25*18=100*18=1800

 

Answer 2

:)