2/3减3/7加括号里1/3加3/7括起来,用简便方法记算
2/3减3/7加括号里1/3加3/7括起来,用简便方法记算
2/3减3/7加括号里1/3加3/7括起来,用简便方法记算
2/3减3/7加括号里1/3加3/7括起来,
=2/3-3/7+(1/3+3/7)
=2/3+1/3+(3/7-3/7)
=1+0
=1
3/7加括号2/3加1/21四括号,
3/7+(2/3+1/21)
=9/21+14/21+1/21
=24/21
=8/7
=1又1/7。
括号3/7×1/41+1/41×2/9括起来乘以63用简便方法算
（3/7×1/41+1/41×2/9）x63
=1/41x（3/7+2/9）x63
=1/41x（3/7x63+2/9x63）
=1/41x（27+14）
=1/41x41
=1
1/3÷括号里2/3-2/5括起来乘3/5怎么简便
解: 1/3÷(2/3-2/5)*3/5
=1/3÷(10/15-6/15)*3/5
=1/3÷ 4/15*3/5
=1/3 * 15/4 *3/5
=5/4*3/5
=3/4
1/42除以括号1/6减3/14加2/3减2/7括起来
1/14
-
解析：
1/42÷(1/6-3/14+2/3-2/7)
=1/42÷(5/6-1/2)
=1/42÷(1/3)
=3/42
=1/14
括号3/5加1/6减2/15括号乘30简便方法计算
（3/5+1/6-2/15）×30
=3/5×30+1/6×30-2/15×30
=18+5-4
=19
5/9加括号里3/4-1/3,简便方法怎么算?
5/9+（3/4-1/3）
=5/9+（27/36-12/36）
=20/36+15/36
=35/36
2/3加括号2/3减1/2括号乘以6/7简便计算
2/3加括号2/3减1/2括号乘以6/7简便计算
2/3加括号2/3减1/2括号乘以6/7
=2/3+(2/3-1/2)*6/7
=2/3+1/6*6/7
=2/3+1/7
=17/21
2/7×3/4 75%×3/7加×79÷括号1÷4/3简便运算
=7分之2×0.75+7分之3×0.75+7分之9÷3分之4
=（7分之2+7分之3）×0.75+7分之9×0.75
=（7分之5+7分之9）×0.75
=2×0.75
=1.5
3/7-括号1/2-3/7括起来加1/2
3/7-(1/2-3/7)+1/2
=3/7-1/2+3/7+1/2
=(3/7+3/7)+(1/2-1/2)
=6/7+0
=6/7
