问题
填空题
-7+13-6+20=______;
|
答案
①-7+13-6+20
=(-7-6)+(13+20)
=-13+33
=20;
②
÷(-23 7
)1 7
=
×(-3 7
)7 15
=-
;1 5
③-64÷3
×1 5 5 8
=-64×
×5 16 5 8
=-
.25 2
-7+13-6+20=______;
|
①-7+13-6+20
=(-7-6)+(13+20)
=-13+33
=20;
②
÷(-23 7
)1 7
=
×(-3 7
)7 15
=-
;1 5
③-64÷3
×1 5 5 8
=-64×
×5 16 5 8
=-
.25 2