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X x 28 + X x 2 = 600
X x ( 28 + 2 ) = 600
X x 30 = 600
X = 600 : 30
X = 20
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a) 20 x 40 = 800 70 x 60 = 4 200 400 x 20 = 8 000 900 x 30 = 27 000
b) 900 : 30 =30 240: 80 = 3 3 600 : 600 =6 28 000 : 400=70
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Lời giải:
a. $=(327-27)+(216-16)+600=300+200+600=1100$
b. $=16\times 48+16\times 24+16\times 28$
$=16\times (48+24+28)=16\times 100=1600$
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X+500=600+600+800
X+500=2000
X=2000-500
X=1500
x + 500 = 600 + 600 + 800
x + 500 = 1200 + 800
x + 500 = 2000
x = 2000 - 500
x = 1500
Vậy x = 1500
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Đáp án đúng là:
(600 + 30) + 5 = 600 + (30 + 5)
(600 x30) x 5 = 600 x ( 30 x 5)
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X = 9600 - 3785
X = 5815
b) 48 x X = 2 496
X = 2496 : 48
X = 52
c) X - 7 486 = 10 253
X = 10 253 + 7486
X = 17 739
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x+1+x+4+x+7+x+10+...+x+28=155
10x + (1+4+7+10+...+28)=155
SSH :(28-1):3+1=10
TD (28+1)x10 :2=145
=> 10x + 145 = 155
10x=155-145
10x=10
x=10:10
x=1