计算.(1)3×(-2)2-3×(-4)+(-5)2×0.2; (2)?22÷47×(34?47)+33÷(?9);(3)?112÷34×(
计算.(1)3×(-2)2-3×(-4)+(-5)2×0.2;(2)?22÷47×(34?47)+33÷(?9);(3)?112÷34×(?0.2)×134÷1.4×(?...
计算.(1)3×(-2)2-3×(-4)+(-5)2×0.2; (2)?22÷47×(34?47)+33÷(?9);(3)?112÷34×(?0.2)×134÷1.4×(?35); (4)(?8.1)÷214×49×(?116)?4+(?2)3.
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小小小圣手487
推荐于2016-04-04
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(1)3×(-2)
2-3×(-4)+(-5)
2×0.2
=3×4+12+25×0.2
=12+12+5
=29;
(2)
?22÷×(?)+33÷(?9)=-4×
×
+27÷(-9)
=-1
-3
=-4
;
(3)
?1÷×(?0.2)×1÷1.4×(?)=-
×
×
×
×
×
=
;
(4)
(?8.1)÷2××(?)?4+(?2)3=8.1×
×
×
-4-8
=0.1-4-8
=-11.9.
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