(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6(4)45+(-9)+(-91)+15求大家帮帮忙,这是下学期的,我还没学,这四道实在不会要赶快,马上就要交了

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(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6(4)45+(-9)+(-91)+15求大家帮帮忙,这是下学期的,我还没学,这四道实在不会要赶快,马上就要交了
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(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6(4)45+(-9)+(-91)+15求大家帮帮忙,这是下学期的,我还没学,这四道实在不会要赶快,马上就要交了
(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6
(4)45+(-9)+(-91)+15求大家帮帮忙,这是下学期的,我还没学,这四道实在不会
要赶快,马上就要交了

(1)0.65+(-1.9)+(-0.1)+(-0.65) (2)(-5.4)+0.2+(-0.6)+0.8 (3)0.65+(-1.9)+(-0.1)+(-0.6(4)45+(-9)+(-91)+15求大家帮帮忙,这是下学期的,我还没学,这四道实在不会要赶快,马上就要交了
(1)0.65+(-1.9)+(-0.1)+(-0.65)
=-2
(2)(-5.4)+0.2+(-0.6)+0.8
=(-5.4)+(-0.6)+0.2+0.8
=-6+1
=-5
(3)0.65+(-1.9)+(-0.1)+(-0.6)
=0.65-2.6
=-1.95
(4)45+(-9)+(-91)+15
=45+15+(-9)+(-91)
=60-100
=-40