脱式计算,能简算的要简算.12×(12+13-14) 4×0...

2025-03-13 09:13:32
推荐回答(1个)
回答1:

(1)12×(
1
2
+
1
3
-
1
4

=12×
1
2
+12×
1
3
-12×
1
4

=6+4-3
=10-3
=7;

(2)4×0.8×0.25×12.5
=(4×0.25)×(0.8×12.5)
=1×10
=10;

(3)2.92×
3
7
+4.06÷2
1
3

=2.92×
3
7
+4.06×
3
7

=(2.92+4.06)×
3
7

=6.98×
3
7

=
1047
350


(4)85.7×25+85.7×74+85.7
=85.7×(25+74+1)
=85.7×100
=8570.