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7.2÷[1.8×(3.4%2.9)]怎样简算

解:依题意得算式, 7.2÷1.8×(3.4-2.9) =4×0.5 =2 7.2÷1.8×(3.4-2.9)=2

2.85-(3.4-0.4)÷3 =2.85-3÷3 =2.85-1 =1.75

6-1.8÷9/10÷4/5 =6-2÷4/5 =6-2.5 =3.5 2/5×0.125÷5/3÷1/8 =2/5×0.125×3/5×8 =(2/5×3/5×(0.125×8) =6/25×1 =6/25 [5/7÷(5/7×2/3)]÷6/7 =[5/7÷5/7÷2/3]÷6/7 =[1÷2/3]÷6/7 =3/2÷6/7 =7/4

(1)25×4.4,=25×4+25×0.4,=100+10,=110;(2)7.7×0.16÷7.7×12.5,=7.7÷7.7×0.8×0.2×12.5,=1×0.2×12.5×0.8,=0.2×10,=2;(3)10.64÷(3.7-2.9),=10.64÷0.8,=13.3;(4)4.8×99+4.8,=4.8×(99+1),=4.8×100,=480;(5)47.3+21×(3...

(1)3.2×2.5×1.25=0.8×4×2.5×1.25=(0.8×1.25)×(4×2.5)=1×10=10 (2)7.26-5.4+1.74-1.6 =(7.26+1.74)-(5.4+1.6)=9-7=2 (3)6.3÷45=6.3÷(9×5)=6.3÷9÷5=0.7÷5=0.14(4)2.8×0.5+0.5×28.2-0.5=(2.8+28.2-1)×0.5=30×0.5=15 (5)(1.6...

(1)3.7+6.3×0.5,=3.7+3.15,=6.85;(2)21.6÷3×(20-19.8),=7.2×0.2,=1.44;(3)2.5×2.9×4×2,=(2.5×4)×(2.9×2),=10×5.8,=58;(4)16.53-3.57-6.43,=16.53-(3.57+6.43),=16.53-10,=6.53;(5)5.28×9.8+0.2×5.28,=(9.8+0...

=((1x5x7x8x10)x(2x11)x(3x9)x(4x6))/(27x25x24x22) =2800/25 =112

0.5×19分之6+4又2分之1÷1.5 =1/2*6/19+9/2*3/2 =3/19+27/4 =525/76

这是几年级的数学题呀

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