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7.2÷16 08脱式计算,怎么算?

(30-7x2)÷2 =(30-14)÷2 =16÷2 =8

(1)7.2×[(7.8+15)÷0.4]=7.2×[8÷0.4]=7.2×20=144;(2)180×[(12+13)×15]=180×[56×15]=180×16=30.

①72.8÷2.5÷4,=72.8÷(2.5×4),=72.8÷10,=7.28;②0.83×7.2+0.83×2.8,=0.83×(7.2+2.8)=0.83×10,=8.3;③18.305÷0.14-58.67,=130.75-58.67,=72.08;④7.8×9.9,=7.8×(10-0.1),=7.8×10-7.8×0.1,=78-0.78,=77.22.

2-8/3/16/7-7/1脱式计算 2-3/8÷7/16-1/7 =2-3/8*16/7-1/7 =2-(6/7+1/7) =2-1 =1

1.53+23.4÷7.2 =1.53+3.25 =4.78

(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...

18-7-9 =11-9 =2

请把题目写清楚

(16.8+14.7)÷0.7×1.2 =31.5÷0.7×1.2 =45×1.2 =54

69.6÷2.4+17.92 =29+17.92 =46.92 15.8×10.1+0.62 =15.8x(10+0.1)+0.62 =158+1.58+0.62 =158+2.2 =160.2 6.8-20.16÷7.2 =6.8-2.8 =4

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