Toán Lớp 6: Tính hợp lý:
a)(216-45)-16
b)-243-(157-234)
c)
d)(-233-47)+(133-53)
e)-(423-135)-(235-223)
f)-(125-246)+(54-75)
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Toán Lớp 6: Tính hợp lý:
a)(216-45)-16
b)-243-(157-234)
c)
d)(-233-47)+(133-53)
e)-(423-135)-(235-223)
f)-(125-246)+(54-75)
Comments ( 2 )
=216−45−16
=(216−16)−45
=200−45
=155
b)−243−(157−234)
=−243−157+234
=(−234+234)−157
=0−157
=−157
c)-(-125 – 246) + (54 – 75)
=125+246+54−75
=(125−75)+(246+54)
=50+300
=350
d)(−233−47)+(133−53)
=−233−47+133−53
=(−233+133)−(47+53)
=−100−100 =−200
e)−(423−135)−(235−223)
=−423+135−235+223
=(−423+223)+(135−235)
=−200−100
=−300
f)−(125−246)+(54−75)
=−125+246+54−75
=−(125+75)+(246+54)
=−200+300
=100