(1)原式= 125 - 150+30
= 125 - 5
= 120 (2)原式=
×45+
×45
=30+6
=36
(3)原式=(1.8 + 4.2)+(4.3 + 0.7)
=6+5
=11 (4)原式= 8.3×(9.9 + 0.1)
= 8.3× 10
= 83
(5)原式= 2.67×4×25
= 2.67× 100
= 267 (6)原式=
+
-
=1 -
=
(1)原式= 125 - 150+30
= 125 - 5
= 120 (2)原式=
×45+
×45
=30+6
=36
(3)原式=(1.8 + 4.2)+(4.3 + 0.7)
=6+5
=11 (4)原式= 8.3×(9.9 + 0.1)
= 8.3× 10
= 83
(5)原式= 2.67×4×25
= 2.67× 100
= 267 (6)原式=
+
-
=1 -
=