计算下列各题:(1)23-17-(-7)+(-16)(2)(?81)÷94×49÷(?16)(3)(?114+58?712)×(?24)(4)?14?
计算下列各题:(1)23-17-(-7)+(-16)(2)(?81)÷94×49÷(?16)(3)(?114+58?712)×(?24)(4)?14?(1?0.5)×13...
计算下列各题:(1)23-17-(-7)+(-16)(2)(?81)÷94×49÷(?16)(3)(?114+58?712)×(?24)(4)?14?(1?0.5)×13×[2?(?3)2](5)3x2+2xy-4y2-3xy+4y2-3x2.
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猴瘸瘟1
2015-01-25
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(1)原式=23-17+7-16
=(23+7)-(17+16)
=30-33
=-3;
(2)
(?81)÷×÷(?16)原式=
(?81)××÷(?16)=1;
(3)
(?1+?)×(?24)原式=
?×(?24)+×(?24)?×(?24)=30-15+14
=29;
(4)
?14?(1?0.5)××[2?(?3)2]原式=
?1?××(2?9)=-1-
×(?7)=
;
(5)3x
2+2xy-4y
2-3xy+4y
2-3x
2原式=(3x
2-3x
2)+(2xy-3xy)+(-4y
2+4y
2)
=-xy.
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