用简便方法计算.7.09×98+7.09×282×19+7213+58134×413×25×3.75(1-12-13+16)÷112.-数学
题文
用简便方法计算.
|
答案
(1)7.09×98+7.09×2, =7.09×(98+2), =7.09×100, =709; (2)82×
=
=
=19
(3)4×
=(4×25)×(
=100×
=
(4)(1-
=(1-
=1×12- |
题文
用简便方法计算.
|
答案
(1)7.09×98+7.09×2, =7.09×(98+2), =7.09×100, =709; (2)82×
=
=
=19
(3)4×
=(4×25)×(
=100×
=
(4)(1-
=(1-
=1×12- |