计算:(1) (+1.75)+(- 1 3 )+(+ 4 5 )+(+1.05)+(- 2 3 )+(+2.2) (2) (
计算:(1)(+1.75)+(-13)+(+45)+(+1.05)+(-23)+(+2.2)(2)(12-23+0.4)×(-30)(3)(-0.1)÷12×(-100)...
计算:(1) (+1.75)+(- 1 3 )+(+ 4 5 )+(+1.05)+(- 2 3 )+(+2.2) (2) ( 1 2 - 2 3 +0.4)×(-30) (3) (-0.1)÷ 1 2 ×(-100) (4) (-2) 3 -3 2 (5) 36×( 1 2 - 1 3 ) 2 (6) 16÷(-2 ) 3 -(- 1 8 )×(-4) (7) 101-102+103-104+…+199-200
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(1)原式=1.75-
=(1.75+0.8+1.05+2.2)-(
=5.8-1 =4.8; (2)原式=
=-15+20-12 =-7; (3)原式=( -
=(-
=20; (4)原式=-8-9 =-17; (5)原式= 36×(
=36×
=1; (6)原式= 16÷(-8)-
=-2-
= -
(7)原式=(-1)+(-1)+…+(-1) =(-1)×50 =-50. |
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