用简便方法计算下面各题. (80+8)×25 38×101 65×99+65 36×99 38×29+38 35×37+65×37
用简便方法计算下面各题.(80+8)×2538×10165×99+6536×9938×29+3835×37+65×37....
用简便方法计算下面各题. (80+8)×25 38×101 65×99+65 36×99 38×29+38 35×37+65×37.
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(80+8)×25, =80×25+8×25, =2000+200, =2200; 38×101, =38×(100+1), =3800+38×1, =3838; 65×99+65, =65×(99+1), =65×100, =6500; 36×99, =36×(100-1), =36×100-36, =3600-36, =3564; 38×29+38, =38×(29+1), =38×30, =1140; 35×37+65×37, =37×(35+65), =37×100, =3700. |
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