计算、21×【1+1/7】 3/7÷3-1/21= 5/9× 6/25÷3/10 1/9×24+24×8/9
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![计算、21×【1+1/7】 3/7÷3-1/21= 5/9× 6/25÷3/10 1/9×24+24×8/9](/uploads/image/z/9196357-13-7.jpg?t=%E8%AE%A1%E7%AE%97%E3%80%8121%C3%97%E3%80%901%EF%BC%8B1%2F7%E3%80%91+3%2F7%C3%B73-1%2F21%3D+5%2F9%C3%97+6%2F25%C3%B73%2F10+1%2F9%C3%9724%EF%BC%8B24%C3%978%2F9)
计算、21×【1+1/7】 3/7÷3-1/21= 5/9× 6/25÷3/10 1/9×24+24×8/9
计算、21×【1+1/7】 3/7÷3-1/21= 5/9× 6/25÷3/10 1/9×24+24×8/9
计算、21×【1+1/7】 3/7÷3-1/21= 5/9× 6/25÷3/10 1/9×24+24×8/9
21×【1+1/7】
=21×1+21×1/7
=21+3
=24
3/7÷3-1/21=
=1/7-1/21
=2/21
5/9× 6/25÷3/10
=5/9×6/25×10/3
=4/9
1/9×24+24×8/9
=24×(1/9+8/9)
=24×1
=24