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a) 1 267 + 99 + 501 = 1 267 + (99 + 501)
= 1 267 + 600 = 1 867
25 x 14 x 4 = (25 x 4) x 14
= 100 x 14 = 1 400
b) 3 905 x (50 – 1) = 3 905 x 50 – 3 905 x 1
= 195 250 – 3 905 = 191 345
270 : ( 27 x 2 ) = 270 : 27 : 2
= 10 : 2 = 5
c) 115 x 58 + 115 x 42 = 115 x (58 + 42)
= 115 x 100 = 11 500
136 x 67 – 136 x 66 = 136 x (67 – 66)
= 136 x 1 = 136
b) 168 + 2080 + 32= (168 + 32) + 2080
= 200 + 2080 = 2280
87 + 94 + 13 + 6= ( 87 + 13) + (94 +6)
= 100 + 100
121 + 85 + 115 +469= (121 + 469) + ( 85 + 115)
= 590 + 200 = 790.
(115+125) + (135 + 145) + 160
= 240 + 280 + 160
= (240+160) + 280
= 400 + 280
= 680
115+125) + (135 + 145) + 160
= 240 + 280 + 160
= (240+160) + 280
= 400 + 280
= 680
168 + 2080+ 32
= ( 168 + 32 ) + 2080
= 200 + 2080
= 2280.
87 + 94 + 13 + 6
= ( 87 + 13 ) + ( 94 + 6 )
= 100 + 100
= 200.
121 + 85 + 115 + 469
= ( 121 + 469 ) + ( 85 + 115 )
= 590 + 200
= 790.
a, 168+2080+32
=(168+32)+2080
=200+2080
=2280
b,87+94+13+6
=(87+13)+(94+6)
=100+100
=200
c,121+85+115+469
=(121+469)+(85+115)
=590+200
=790
= ( 11 + 89 ) + ( 22 + 78 ) + ( 33 + 67 ) + ( 44 + 56 ) + 55
= 100 + 100 + 100 + 100 + 55
= 400 + 55
= 455
HT
phuonglebao9@gmail.com
=<89+11>+<78+22>+<67+33>+<56+44>+55
=100+100+100+100+55
=400+55
=455
Hướng dẫn giải:
a) 93 + 39 + 7 = (93 + 7) + 39 = 100 + 39 = 139.
89 + 85 + 11 = (89 + 11) + 85 = 100 + 85 = 185
184 + 66 + 16 = (184 + 16) + 66 = 200 + 66 = 266
b) 23 + 52 + 47 + 98 = (23 + 47) + (52 + 98) = 70 + 150 = 220
16 + 490 + 84 + 10 = (16 + 84) + (490 + 10) = 100 + 500 = 600
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
104 x (14 + 6 )
= 104 x 20
= 2080
67 x 136 + 33 x 136
= ( 67 + 33 ) x 136
= 100 x 136
= 13600
51 x 115 - 115 x 41
= ( 51 - 41 ) x 115
= 10 x 115
= 1150
104 x ( 14+6 )
= 104 x 20
= 104 x 10 x 2
1040 x 2 =2080 k nha mình đang âm