计算下列各题(1)56÷23-13×(-9)2+32(2)(-24)×(112-16+38)(3)3.14×6.49+3.14×(-5.49)-9×(-3.14)(4)(-112)2-(-23+12)÷(-16)3.-数学
题文
计算下列各题 (1)
(2)(-24)×(
(3)3.14×6.49+3.14×(-5.49)-9×(-3.14) (4)(-1
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答案
(1)
=
=
=-
(2)(-24)×(
=
=-2+4-9, =-11+4, =-7; (3)3.14×6.49+3.14×(-5.49)-9×(-3.14) =3.14×(6.49-5.49+9), =3.14×10, =31.4; (4)(-1
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