5/9÷1/7+4/9×7=
九分之五除七分之一加九分之四乘七等于多少 -
乘法分配律,
计算过程如下:5/9÷1/7+4/9×7 =5/9×7+4/9×7 =(5/9+4/9)×7 =1×7 =7
乘法分配律,
计算过程如下:5/9÷1/7+4/9×7 =5/9×7+4/9×7 =(5/9+4/9)×7 =1×7 =7
可以运用乘法分配律进行计算。5/9÷7+4/9×1/7 =5/9×1/7+4/9×1/7 =(5/9+4/9)×1/7 =1×1/7 =1/7
=4/5×5/9÷7 =4/9×1/7 =4/63
5/7÷9十4/7×1/9怎么简便计算? -
充分运用结合律,可以简化计算过程:
原式等于4/63+5/63=9/63=1/7
4/9÷7 1/7×5/9 -
4/9÷7=28/7 1/7x5/9=5/63
3×7/9=21/9 5×7/9=35/9 1/9÷1/7=7/9 所以最后的结果就是,分母相同,分子相加,21加,35加,七等于,63所以最后的结果就是63/9=7
5/7÷1/9十5/7-5/7x9用简便方法计算 -
5/7÷1/9十5/7-5/7x9 =5/7x9十5/7-5/7x9 =5/7x9-5/7x9十5/7 =5/7x(9-9)十5/7 =5/7
2/7*1/9+5/7*1/9 =1/9*(2/7+5/7)=1/9