15/23*19+19/23*8简便计算15/23*19+19/23*8简便计算12÷[(4.3-2.38)*25]简便计算

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15/23*19+19/23*8简便计算15/23*19+19/23*8简便计算12÷[(4.3-2.38)*25]简便计算15/23*19+19/23*8简便计算15/23*19+19/23*8简便

15/23*19+19/23*8简便计算15/23*19+19/23*8简便计算12÷[(4.3-2.38)*25]简便计算
15/23*19+19/23*8简便计算
15/23*19+19/23*8简便计算
12÷[(4.3-2.38)*25]简便计算

15/23*19+19/23*8简便计算15/23*19+19/23*8简便计算12÷[(4.3-2.38)*25]简便计算
15/23*19+19/23*8
=19/23*15+19/23*8
=19/23*(15+8)
=19/23*23
=19
12÷[(4.3-2.38)*25]
=12÷[(4.3-2.38)*25]
=12÷(1.92*25)
=12÷(12*0.16*25)
=1÷(0.16*254
=1÷4
=1/4

15/23*19+19/23*8
=19/23*15+19/23*8
=19/23*(15+8)
=19/23*23
=19

15/23*19+19/23*8
=19/23×15+19/23×8
=(15+8)×19/23
=19