
计算:(1)(-1.2)+1.8;(2)4.6?(?34+1.6?4)?34;(3)(-84)÷2×(-3)÷(-6);(4)?216×5?21
计算:(1)(-1.2)+1.8;(2)4.6?(?34+1.6?4)?34;(3)(-84)÷2×(-3)÷(-6);(4)?216×5?216×(?4)+136×(?...
计算:(1)(-1.2)+1.8;(2)4.6?(?34+1.6?4)?34;(3)(-84)÷2×(-3)÷(-6);(4)?216×5?216×(?4)+136×(?8);(5)[(?3)2?22?(?5)2]×(56÷49)×(?2)4.
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(1)原式=1.8-1.2=0.6;
(2)原式=4.6+
-1.6+4-
=4.6-1.6+4=7;
(3)原式=-42×(-3)÷(-6)=42÷(-2)=-21;
(4)原式=
×[-5-(-4)+(-8)]=
×(-9)=?
;
(5)原式=(9-4-25)×(
×
)×16=(-20)×16×
×
=-600.
(2)原式=4.6+
3 |
4 |
3 |
4 |
(3)原式=-42×(-3)÷(-6)=42÷(-2)=-21;
(4)原式=
13 |
6 |
13 |
6 |
39 |
2 |
(5)原式=(9-4-25)×(
5 |
6 |
9 |
4 |
5 |
6 |
9 |
4 |
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