四年级上册数学运算律整数简便运算计算题
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简介
38×101 =38×(100+1) =38×100+38×1 =3800+38 =3838 68×200×25 =68×(200×25) =68×5000 =340000 101×87﹣87 =(101﹣1)×87 =100×87 =8700 258+98 =258+(100﹣2) =258+100﹣2 =358﹣2 =356 165﹣97 =165﹣(100﹣3) =165﹣100+3 =65+3 =68 56×67+33×56 =56×(67+33) =56×100 =5600 55×14 =55×2×7 =110×7 =770 108×25 =27×4×25 =27×(4×25) =27×100 =2700 24×125 =3×8×125 =3×(8×125) =3×1000 =3000 1111×9+111 =111×(9+1) =111×10 =111
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