Toán Lớp 6: TÍNH HỢP LÝ :
4)19– 42.(-19)+38.5
5) (-87).(1–135) – 135.87
6)(-45).(1+432)– 432.(-45)
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Toán Lớp 6: TÍNH HỢP LÝ :
4)19– 42.(-19)+38.5
5) (-87).(1–135) – 135.87
6)(-45).(1+432)– 432.(-45)
Comments ( 2 )
=19−19.(−42)+38.5
=19+19.42+19.10
=19.(1+42+10)
=19.53
=1007
5)(−87).(1−135)−135.87
=(−87).(1−135)+135.(−87)
=(−87).(1−135+135)
=(−87).1
=−87
6)(−45).(1+432)−432.(−45)
=(−45).(1+432−432)
=(−45).1
=(−45)