问题
解答题
|
答案
①635+9030÷86×13,
=635+105×13,
=635+1365,
=2000;
②4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
③45×101,
=45×(100+1),
=4500+45,
=4545;
④5.7-(1.9-1.3),
=5.7-1.9+1.3,
=5.7+1.3-1.9,
=7-1.9,
=5.1;
⑤
+98 99
×98,98 99
=
×(1+98),98 99
=
×99,98 99
=98;
⑥
÷〔4 5
×(5 8
+1 6
)〕,1 3
=
÷[4 5
×(5 8
+1 6
)],2 6
=
÷[4 5
×5 8
],1 2
=
÷4 5
,5 16
=
×4 5
,16 5
=
,64 25
=2
.14 25