
计算或化简:(1)(?13)×3÷3×(?13)(2)(?6)2÷(?12+13?14)(3)?191819×38(4)?42?|?3|+3×(?13)2
计算或化简:(1)(?13)×3÷3×(?13)(2)(?6)2÷(?12+13?14)(3)?191819×38(4)?42?|?3|+3×(?13)2....
计算或化简:(1)(?13)×3÷3×(?13)(2)(?6)2÷(?12+13?14)(3)?191819×38(4)?42?|?3|+3×(?13)2.
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(1)(?
)×3÷3×(?
)
=(-
)×3×
×(-
)
=
;
(2)(?6)2÷(?
+
?
)
=36×(-2)+36×3-36×4
=-72+108-144
=-108;
(3)?19
×38
=(-20+
)×38
=-20×38+
×38
=-760+2
=-758;
(4)?42?|?3|+3×(?
)2
=-16-3+3×
=-19+
=-18
.
1 |
3 |
1 |
3 |
=(-
1 |
3 |
1 |
3 |
1 |
3 |
=
1 |
9 |
(2)(?6)2÷(?
1 |
2 |
1 |
3 |
1 |
4 |
=36×(-2)+36×3-36×4
=-72+108-144
=-108;
(3)?19
18 |
19 |
=(-20+
1 |
19 |
=-20×38+
1 |
19 |
=-760+2
=-758;
(4)?42?|?3|+3×(?
1 |
3 |
=-16-3+3×
1 |
9 |
=-19+
1 |
3 |
=-18
2 |
3 |
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