30 + 70 + 100 =?
Tính giá trị của biểu thức:
a) 90 – ( 30 – 20) = ..........................
= ..........................
90 – 30 – 20 = ..........................
= ..........................
b) 100 – (60 + 10) = ..........................
= ..........................
100 - 60 + 10 = ..........................
= ..........................
c) 135 – (30 + 5) = ..........................
= ..........................
135 – 30 – 5 = ..........................
= ..........................
d) 70 + (40 – 10) = ..........................
= ..........................
70 + 40 – 10 = ..........................
= ..........................
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
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Tính bằng cách thuận tiện (theo mẫu)?
Mẫu: 30 + 89 + 70 = 30 + 70 + 89 = 100 + 89 = 189 |
a) 30 + 192 + 70 b) 50 + 794 + 50
c) 75+ 219 + 25 d) 725 + 199 + 125
a) 30 + 192 + 70 = 30 + 70 + 192
= 100 + 192 = 292
b) 50 + 794 + 50 = 50 + 50 + 794
= 100 + 794 = 894
c) 75 + 219 + 25 = 75 + 25 + 219
= 100 + 219 = 319
d) 725 + 199 + 125 = 725 + 125 + 199
= 850 + 199 = 1 049
70+30+100+100
70 + 30 + 100 + 100 = 300
Ai tích mk mk tích lại
70+30+100+100=100+100+100
=300
30 + 70 + 80 + 20 + 100 + 100 + 800 =?
30 + 70 + 80 + 20 + 100 + 100 + 800
=(30 + 70) + (80 + 20) + 100 + 100 + 800
=100 + 100 +100 +100 + 800
=100 x 4 + 800
=400 + 800
=1200
30 + 70 + 80 + 20 + 100 + 100 + 800
= (30 + 70) + (80 + 20) + 100 + 100 + 800
= 100 + 100 + 100 + 100 + 800
= 100 . 4 + 800
= 400 + 800
= 1200
=( 30+70) + ( 80+20) + ( 100+100+800)
= 100 + 100 + 1000
= 200 + 1000
= 1200
55 +_______ = 100
________- 35 = 70
70 + 30 =________
100*70+100*30+100*0
Tính thuận tiện
100 */ 70 + 100 * 30 + 100 * 0
= 100 * ( 70 + 30 + 0 )
= 10000
****n nhe
100 x 70 + 100 x 30 x 100 x 0
= 100 x ( 70 + 30 + 0 )
= 100 x 100
= 10000
100 x 70 + 100 x 30 x 100 x 0
= 100 x ( 70 + 30 + 0 )
= 100 x 100
= 10000
7+3+70+30+100
= 10 + 100 + 100
= 10 + 200
= 210
k nha
30 + 40 +50 +70 +100 x 0
20+80+30+70+100+200=?
20+80+30+70+100+200
=100+100+100+200
=500