Math problems will add 300 points.

A regular triangular flower bed with a side length of 4/9.

Its circumference =4/9×3=4/3 decimeter.

A car travels 84 kilometers per hour.

84 kilometers per hour.

Xiaojie's washing machine uses electricity per hour 1 kwh. On one occasion, he washed clothes with a washing machine for 5/4 hours.

A * * * Power consumption =4/5× 1/4= 1/5 kWh

There are 45 footballs in the gym at home, and the number of basketball is 7/9 of football.

There are 35 basketballs in the school gymnasium = 45× 7/9.

A classroom is 8 meters long and 3/4 meters wide.

The width of the classroom = 8× 3/4 = 6m.

Area =8×6=48 square meters

There are 2 apples in the fruit shop/kg 5 yuan, and bananas are 65438+ 1 yuan cheaper than apples.

Banana per kilogram = 5/2× (1-110) = 9/4 yuan.

A kilogram of bananas is cheaper than a kilogram of apples =5/2-9/4= 1/4 yuan.

360 people visited the popular science exhibition in Happiness Primary School, and the number of students who visited the exhibition in Wei Zi Primary School was 65,438+0.

Students visiting the exhibition in Wei Zi Primary School =360×( 1+ 1/6)=420.

Wei Zi Primary School has more students visiting the exhibition than Happiness Primary School =420-360=60.

This year, students planted 100 trees, of which the total number of trees planted in grade six is two fifths, and the number of trees planted in grade five is seven eighths of that in grade six.

Planting trees in the fifth grade = 100×2/5×7/8=35 trees.

Li Hua and Wang Ming go for an outing by bike. Li Hua rides 65438+4/05 per minute and Wang Ming rides 15 km per hour.

Li Hua rides 65438+4/05 = 16/60 per minute and 16 km per hour.

Li Hua is several degrees faster on his bike.