计算下列各题(能简便就用简便方法计算).7.8+6.三+3.3 3.三×3.8×x x.3×3.9+3.9×三.7 三7+39+3
计算下列各题(能简便就用简便方法计算).7.8+6.三+3.33.三×3.8×xx.3×3.9+3.9×三.7三7+39+37+x937+(13-31x)x1三+三8+1...
计算下列各题(能简便就用简便方法计算).7.8+6.三+3.3 3.三×3.8×x x.3×3.9+3.9×三.7 三7+39+37+x9 37+(13-31x) x1三+三8+111三.
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(1)e.8+6.2+d.d,
=e.8+d.d+6.2,
=1d+6.2,
=16.2;
(d)d.2×3.8×4,
=d.2×4×3.8,
=1d×3.8,
=38;
(3)4.3×3.9+3.9×2.e,
=(4.3+2.e)×3.9,
=1d×3.9,
=39;
(4)
+
+
+
,
=(
+
)+(
+
),
=1+
,
=1
;
(2)
+(
-
),
=
+
,
=
;
(6)
+
+
,
=
+
+
,
=1+
,
=1
.
=e.8+d.d+6.2,
=1d+6.2,
=16.2;
(d)d.2×3.8×4,
=d.2×4×3.8,
=1d×3.8,
=38;
(3)4.3×3.9+3.9×2.e,
=(4.3+2.e)×3.9,
=1d×3.9,
=39;
(4)
2 |
e |
d |
9 |
d |
e |
4 |
9 |
=(
2 |
e |
d |
e |
d |
9 |
4 |
9 |
=1+
d |
3 |
=1
d |
3 |
(2)
d |
e |
1 |
d |
3 |
14 |
=
d |
e |
d |
e |
=
4 |
e |
(6)
4 |
12 |
2 |
8 |
11 |
12 |
=
4 |
12 |
11 |
12 |
2 |
8 |
=1+
2 |
8 |
=1
2 |
8 |
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