六年级上册分数简便运算专项

六年级上册分数简便运算专项添“1”法25×32+25=25=25=4029−716=29×(1−7=29×=1920×101−=920=920=45225×99+2=225=225=24058×79+=58=58=5012×1511+711×=12×(1511+=12=1713+7=713×1+7=713=713=1449−7=49−716=49×(1−7=49×=1六年级上册分数简便运算专项拆数法7475=(75−1)×74=75×7475−1×=74−74=73176×3=(75+1)×3=75×325+1×=9+3=9317×17=(16+1)×17=16×1716+1×=17+17=18166×7=(65+1)×7=65×713+1×=35+7=35764×7=(65−1)×7=65×713−1×=35−7=34687×87=(88−1)×87=88×8788−1×=87−87=86120222023=20222023=20222023×2023−2022=2022−2022=20211224×2=(225−1)×2=225×215−1×=30−2=2913六年级上册分数简便运算专项换分子位置13×49+4×=13×49+5×=49=49=82×79+11×=2×79+2×=2×(79+11=2×2=42354×38+23×=23×3854+23×=23×(3854+16=23×1=23611×27+2=611×27+5=27×(611+=27=2821×417+9=821×417+4=417×(821+=417×=4713×511+5=713×511+4=511×(713+=511×=51116×+724+7=1116×724+13=724×(1116+=724×=729×67+1=29×67+2=29×(67+=29=2六年级上册分数简便运算专项添“1”法25×32+25=25=25=4029−716=29×(1−7=29×=1920×101−=920=920=45225×99+2=225=225=24058×79+=58=58=5012×1511+711×=12×(1511+=12=1713+7=713×1+7=713=713=1449−7=49−716=49×(1−7=49×=1六年级上册分数简便运算专项拆数法7475=(75−1)×74=75×7475−1×=74−74=73176×3=(75+1)×3=75×325+1×=9+3=9317×17=(16+1)×17=16×1716+1×=17+17=18166×7=(65+1)×7=65×713+1×=35+7=35764×7=(65−1)×7=65×713−1×=35−7=34687×87=(88−1)×87=88×8788−1×=87−87=86120222023=20222023=20222023×2023−2022=2022−2022=20211224×2=(225−1)×2=225×215−1×=30−2=2913六年级上册分数简便运算专项换分子位置13×49+4×=13×49+5×=49=49=82×79+11×=2×79+2×=2×(79+11=2×2=42354×38+23×=23×3854+23×=23×(3854+16=23×1=23611×27+2=611×27+5=27×(611+=27=2821×417+9=821×417+4=417×(821+=417×=4713×511+5=713×511+4=511×(71