问题
解答题
计算. ①92×13+28 ②4.2÷1.5-0.36 ③78×
④1÷
⑤
⑥2-
⑦36×(
|
答案
①92×13+28
=1196+28,
=1224;
②4.2÷1.5-0.36
=2.8-0.36,
=2.44;
③78×3 79
=(79-1)×
,3 79
=79×
-1×3 79
,3 79
=3-
,3 79
=2
;76 79
④1÷
-1 4
÷11 4
=4-
,1 4
=3
;3 4
⑤
×5÷2 5
×52 5
=
÷2 5
×5×5,2 5
=1×5×5,
=25;
⑥2-
÷8 15 4 9
=2-
,6 5
=
;4 5
⑦36×(
+1 6
)2 3
=36×
+36×1 6
,2 3
=6+24,
=30.