Toán Lớp 5: tính bằng cách thuận tiện nhất:
2174 x 312 + 688 x 2174 – 16 x 25 =
25 x 134 x 4 + 62 x 5 x 11 =
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Toán Lớp 5: tính bằng cách thuận tiện nhất:
2174 x 312 + 688 x 2174 – 16 x 25 =
25 x 134 x 4 + 62 x 5 x 11 =
Comments ( 2 )
2174xx312+688xx2174-16xx25
= 2174xx(312+688)-400
= 2174xx1000-400
= 2174000-400
= 2173600
____________________________________________
25xx134xx4+62xx5xx11
= (25xx4)xx134+(62xx5)xx11
= 100xx134+310xx11
= 13400+3410
= 16810
@Pảk
2174 x 312 + 688 x 2174 – 16 x 25
= 2174x(312+688)- 16×25
= 217400- 400
= 21700
25 x 134 x 4 + 62 x 5 x 11
= (25×4)x134+ 310×11
= 13400+3410
= 16810