16x-20=36
=>\(16\times x=20+36=56\)
=>\(x=\frac{56}{16}=\frac72\)
100-30+20=70+20=90
45x2=90
22x11=242
63:9=7
500:2=250
16x - 20=36 => 16x=56 => x=7/2
45x2=90
22x11=242
63:9=8
500:2=250
16x-20=36
=>\(16\times x=20+36=56\)
=>\(x=\frac{56}{16}=\frac72\)
100-30+20=70+20=90
45x2=90
22x11=242
63:9=7
500:2=250
16x - 20=36 => 16x=56 => x=7/2
45x2=90
22x11=242
63:9=8
500:2=250
1000 + 900 + 800 + 700 + 600 + 500 + 400 + 300 + 200 + 100 + 90 + 80 + 70 + 60 + 50 + 40
+ 30 + 20 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 + 0 =
Nếu 9 bằng 72
8 bằng 56
7 bằng 63
6 bằng 30
5 bằng 20
Thì 3 bằng ?
Viết (theo mẫu) :
a) Mẫu: 482 = 400 + 80 + 2
687 = .......
460 = .......
141 = .......
505 = .......
735 = .......
986 = .......
b) Mẫu: 200 + 50 + 9=259
600 + 70 + 2 = ......
300 + 90 + 9 = .......
400 + 40 + 4 = .......
900 + 50 + 1 = ........
500 + 20 = .......
700 + 3 = ............
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
Điền dấu (>;<;=) thích hợp vào chỗ chấm:
398…400
911…889
245…254
567…500+60+5
329…300+20+9
1000…900+90+8
16 - 10 + 9 + 1 = ???
A. 10
B. 20
C. 30
Tính nhẩm:
2 × 4 = ... 10 : 2 = ...
3 × 8 = ... 15 : 3 = ...
4 × 3 = ... 20 : 4 = ...
5 × 9 = ... 28 : 4 = ...
5 × 5 = ... 40 : 5 = ...
2 × 7 = ... 30 : 5 = ...
30 + 40 + 30 + 20 + 40 + 20 + 40 + 50 + 30 + 20 + 20 + 50 = :)?
Tính nhẩm:
60 + 20 + 10 =
40 + 10 + 20 =
30 + 20 + 20 =
60 + 30 =
40 + 30 =
30 + 40 =
x + 10 = 20 + 63