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计算题:(1)0.5%(+3 )+3.75%(+7 )(2) (...

解:(1)0.5-(+3 )+3.75-(+7 )=0.5-3 +3.75-7 =-7;(2)(-7)×(-5)-90÷(-3)=35+30=65;(3)原式=-8×( )=-8×(- )= ;(4)原式=-12× +12× -12× =-16+9-10=-17;(5)原式=3+60÷4×(- )-1=3-3-1=-1;(6)原式=(-4) 2 -6× =16...

(1)1.29+3.7+2.71+6.3,=(1.29+2.71)+(3.7+6.3),=4+10,=14;(2)3.75÷[0.3×(1.34-0.84)],=3.75÷[0.3×0.5],=3.75÷0.15,=25;(3)7.2×7.2+7.2×2.8,=7.2×(7.2+2.8),=7.2×10,=72;(4)0.25×0.8×0.125×4,=(0.25×4)×(0.125×0...

=(-1又1/2-4又1/2)+(3又1/4+3又3/4)=(-6)+7=1

(1)125×8.8,=125×8×1.1,=1000×1.1,=1100;(2)1.3+4.25+3.7+3.75,=(1.3+3.7)+(4.25+3.75),=5+8,=13;(3)4.8×1.01,=4.8×1+4.8×0.01,=4.8+0.048,=4.848;(4)17.16-(3.5-2.85),=17.16+2.85-3.5,=20.01-3.5,=16.51;(5)...

(1) 5 6 -(0.375×45+1÷3.75÷1.6)÷0.4,= 5 6 -(16 7 8 + 1 6 )÷0.4,= 5 6 -(16 7 8 + 1 6 )÷0.4,= 5 6 -19 1 24 ÷ 2 5 ,=- 2025 48 ;(2)(7 5 18 -6 5 11 )÷[2 14 15 +(4-2 14 25 )÷1.35],= 163 198 ÷[2 14 15 +1 11 25 ÷1.3...

3.75除以1又1/2+(1.5+3又3/4)乘以2又1/7 =3.75÷1.5+(1.5+3.75)×15/7 =2.5+5.25×15/7 =2.5+11.25 =13.75

(—3.75)+5又1/3+(—2又1/7)+(—4又1/3)+3又3/4+(—1又6/7) =(-3.75+3又3/4)+(5又1/3—4又1/3)+(—2又1/7—1又6/7) =0+1-4 =-3

(1)原式=1×5+16÷4=5+4=9;(2)原式=-8×94×49=-8;(3)原式=-3.75+2.85-1.25-0.5+3.15-2.5=(-3.75-1.25)+(2.85+3.15)+(-0.5-2.5)=-5+6-3=-2.

1.(-2.18)+4-(-7.6)+(-五分之三) =-2.18+4+7.6-0.6 =-2.18+4+7 =8.82 2.(-0.5)-(-二又四分之一)+3.75-(+五又二分之一) =-0.5+2.25+3.75-5.5 =-6+6 =0

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