Giải thuận lợi toán lớp 5
3,3 x 13,33 - 1,8 x 3,33 - 0,5 x 9,99
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=1,8 * 1/0,25 +1,8 *1/0.5 +1,8*4
=1,8(1/0,25+1/0.5+4)
=1,8*10
=18
\(\frac{19,8:0.2.44,44.2.13,2:0,25}{3,3.88,88:0,5.6,6:0,125.5}\) \(=\frac{19,8.5.44,44.2.13,2.4}{3,3.88,88.2.6,6.8.5}=\frac{3,3.6.5.44,44.2.6,66.4}{3,3.44,44.2.6,6.8.5}\)
\(=\frac{6.2.2}{8}=3\)
6: \(9,5\times4,7+9,5\times4,3+9,5\)
\(=9,5\times\left(4,7+4,3+1\right)\)
\(=9,5\times10=95\)
5: \(32\times1,25\times2,5+0,476+0,524\)
\(=80\times1,25+1\)
=100+1
=101
4: \(3,5\times0,5+3,5\times0,125+3,5\times22,5\times4\)
=3,5x(90+0,5+0,125)
=3,5x90,625
=317,1875
3: \(32\times1,25\times2,5+\frac{54}{10}\times8,7+5,4\times3,3-10,8\)
\(=40\times2,5+5,4\times8,7+5,4\times3,3-5,4\times2\)
=100+5,4x(8,7+3,3-2)
=100+5,4x10
=100+54
=154
2: \(15,25\times0,5+15,25\times0,25+15,25\times0,125+15,25\times6\)
=15,25x(0,5+0,25+0,125+6)
=15,25x6,875
=104,84375
1: 2020x0,56+0,34x6060+8080x0,85+2020x5,02
=2020x0,56+2020x1,02+2020x3,4+2020x5,02
=2020x(0,56+1,02+3,4+5,02)
=2020x10
=20200
19,8:0,2x44,44x2x13,20:0,25=464593,536
3.3*88.88/0.5*6.6/0.125*5=154864.512
tk cho mk và kb vs mk nhé
8,2 x 5,5 + 24,6 x1,5
= 45,1 + 36,9
= 82
2)a): 2,85 * 156,23 - 2,85 * 56,23
=2,85 * ( 156,23 - 56,23 )
=2,85 * 100
= 285
2)b): = 1,5+(1,8+4,2)+(2,1+3,9)+(2,4+3,6)+(2,7+3,3)+3
= 1,5+(6+6+6+6)+3
=1,5+24+3
=28,5
Bài 1: Tìm y biết (14,17 - y) * 2/9 = 1/3
Bài 2: Tính nhanh
2,85 * 156,23 - 2,85 * 56,23
___________________________
1,5 + 1,8 + 2,1 + 2,4 + 2,7 + 3 + 3,3 + 3,6 + 3,9 +4,2
Bài 3: Tìm x
13,44 * x - (16 + x) * 0,5 - 3,7 * (x - 0,9) = 13,618
Ta có: \(19,8:2\times44,44\times2\times13,2:0,25\)
\(=9,9\times88,88\times13,2\times4\)
\(=9,9\times52,8\times88,88\)
Ta có: \(3,3\times88,88:0,5\times6,6:0,125\times5\)
\(=3,3\times2\times88,88\times6,6\times8\times5\)
\(=6,6\times88,88\times6,6\times40\)
\(=6,6\times88,88\times6,6\times8\times5=33\times52,8\times88,88\)
TA có: \(\frac{19,8:2\times44,44\times2\times13,2:0,25}{3,3\times88,88:0,5\times6,6:0,125\times5}\)
\(=\frac{9,9\times52,8\times88,88}{33\times52,8\times88,88}=\frac{9.9}{33}=\frac{3}{10}\)
3,3 x 13,33 - 1,8 x 3,33 - 0,5 x 9,99
43,989 − 5,994 − 4,995 = 33
3,3 x 13,33 - 1,8 x 3,33 - 0,5 x 9,99
= 1,1 x 3 x 13,33 - 0,6 x 3 x 3,33 - 0,5 x 9,99
= 1,1 x (3 x 13,33) - 0,6 x (3 x 3,33) - 0,5 x 9,99
= 1,1 x 39,99 - 0,6 x 9,99 - 0,5 x 9,99
= 1,1 x 39,99 - 9,99 x (0,6 + 0,5)
= 1,1 x 39,99 - 9,99 x 1,1
= 1,1 x (39,99 - 9,99)
= 1,1 x 30
= 33