计算:(1)6-(+3)-(-7)+(-2);(2)-0.5-(-3 1 4 )+2.75-7;(3)-|-9|×|-1 2
计算:(1)6-(+3)-(-7)+(-2);(2)-0.5-(-314)+2.75-7;(3)-|-9|×|-123|-(10);(4)-22×2-3×(-1)2;(5...
计算:(1)6-(+3)-(-7)+(-2);(2)-0.5-(-3 1 4 )+2.75-7;(3)-|-9|×|-1 2 3 |-(10);(4)-2 2 ×2-3×(-1) 2 ;(5)( 2 3 - 1 12 - 1 15 ) ÷(- 1 60 ) ; (6)-99 71 72 ×36(用简便方法计算).
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(1)6-(+3)-(-7)+(-2) =6-3+7-2 =8; (2)-0.5-(-3
=-0.5+3.25+2.75-7 =(-0.5-7)+(3.25+2.75) =-7.5+6 =-1.5; (3)-|-9|×|-1
=-9×
=-15-10 =-25; (4)-2 2 ×2-3×(-1) 2 =-4×2-3×1 =-8-3 =-11; (5)(
=(
=-40+5+4 =-31; (6)-99
=(-100+
=-3600+
=-3599
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