计算.①92×13+28②4.2÷1.5-0.36③78×379④1÷14-14÷1⑤25×5÷25×5⑥2-815÷49⑦36×(16+23)-数学
题文
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×
=(79-1)×
=79×
=3-
=2
④1÷
=4-
=3
⑤
=
=1×5×5, =25; ⑥2-
=2-
=
⑦36×(
|