Thực hiện phép tính
Bài 1: Thực hiện phép tính:
1, 18.76+15.18+9.18.
4, 44.45+46.44+9.44.
7, 17.34+17.39+27.17.
10, 879.2+879.5+879.3.
2, 3.25.8+4.6.37 +2.38.12.
3, 11+12+13+...+20.
5, 2.31.12+4.6.42+8.27.3.
8, 43.17+29.57 +13.43+57.
6, 11+13+15+...+25.
9, 34+35+36 +...+43.
11, 37.75+37.45+ 63.67+63.53. 12, 12+14+16+.....+26
13, 58.76+47.58-58.23. 14, 35.34+35.86+65.75 +65.45. 15, 26+27+25+
Bài 2: Tìm x biết:
1, 18.(x-16)=0.
2, 2x-11=23.
3, 2.(x+4)+5=65.
+33
4, (x-15).72 0.
5, 4x-15=21.
7, (x-32).45-0.
8, 125+3x 251.
10, (x-35).15 0.
11, (x-35)-120=0.
6, 60-3.(x-2)=51.
9, 96-3.(x+1)=42.
12, 21-3.(x-2)=18.
1, 18.76+15.18+9.18.
4, 44.45+46.44+9.44.
7, 17.34+17.39+27.17.
10, 879.2+879.5+879.3.
2, 3.25.8+4.6.37 +2.38.12.
3, 11+12+13+...+20.
5, 2.31.12+4.6.42+8.27.3.
8, 43.17+29.57 +13.43+57.
6, 11+13+15+...+25.
9, 34+35+36 +...+43.
11, 37.75+37.45+ 63.67+63.53. 12, 12+14+16+.....+26
13, 58.76+47.58-58.23. 14, 35.34+35.86+65.75 +65.45. 15, 26+27+25+
Bài 2: Tìm x biết:
1, 18.(x-16)=0.
2, 2x-11=23.
3, 2.(x+4)+5=65.
+33
4, (x-15).72 0.
5, 4x-15=21.
7, (x-32).45-0.
8, 125+3x 251.
10, (x-35).15 0.
11, (x-35)-120=0.
6, 60-3.(x-2)=51.
9, 96-3.(x+1)=42.
12, 21-3.(x-2)=18.