计算.①92×13+28②4.2÷1.5-0.36③78×379④1÷14-14÷1⑤25×5÷25×5⑥2-815÷49⑦36×(16+23)-数学

题目简介

计算.①92×13+28②4.2÷1.5-0.36③78×379④1÷14-14÷1⑤25×5÷25×5⑥2-815÷49⑦36×(16+23)-数学

题目详情

计算.
①92×13+28
②4.2÷1.5-0.36
③78×
3
79

④1÷
1
4
-
1
4
÷1
2
5
×5÷
2
5
×5
⑥2-
8
15
÷
4
9

⑦36×(
1
6
+
2
3
题型:解答题难度:中档来源:不详

答案

①92×13+28
=1196+28,
=1224;

②4.2÷1.5-0.36
=2.8-0.36,
=2.44;

③78×class="stub"3
79

=(79-1)×class="stub"3
79

=79×class="stub"3
79
-1×class="stub"3
79

=3-class="stub"3
79

=2class="stub"76
79


④1÷class="stub"1
4
-class="stub"1
4
÷1
=4-class="stub"1
4

=3class="stub"3
4


class="stub"2
5
×5÷class="stub"2
5
×5
=class="stub"2
5
÷class="stub"2
5
×5×5,
=1×5×5,
=25;

⑥2-class="stub"8
15
÷class="stub"4
9

=2-class="stub"6
5

=class="stub"4
5


⑦36×(class="stub"1
6
+class="stub"2
3

=36×class="stub"1
6
+36×class="stub"2
3

=6+24,
=30.

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