1/Đặt tính rồi tính
35,7 x 4,6 91,08 : 3,6
54,79 + 6,403 342,55 – 76,4
2/ Tìm x , biết :
x : 10 = 247 x 0,01
3/ Tính thuận tiện nhất:
56,8 x 38,7 + 61,3 x 56,8
4/Một mảnh vườn hình chữ nhật có chu vi 280m , chiều dài 85m .
Tính diện tích mảnh vườn đó?
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