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1. Q=165+247+528+125+315
= 100+60+5+200+40+7+500+20+8+100+20+5+300+10+5
= ( 100+200+500+100+300) + ( 60+40+20+20+10 ) +( 5+7+8+5+5 )
= 1200+150+30
=1280
R=1234+5678+8+80
=1000+200+30+4+5000+600+70+8+8+80
= ( 1000+5000) + ( 200+600 ) + (30+70+80) + ( 4+8+8)
=6000+800+180+20
=7000
Bài 1
Tính : Q=165+247+528+125+315
=(165+125)+(247+315+528)
=290+1090
= 1380
R=1234+5678+8+80
=(1234+6)+(5678+2)+80
= 1240+5680+80
= (1240+60)+(5680+20)
=1300+5700=7000
Bài 2:
A= 243-97=(243+7)-(97-7)=250-90=160
B= 400-42-58=400-(42+58)=400-100=300
C=600-67-33=600-(67+33)=600-100=500
D=200-24-46=200-(24+46)=200-70=130
E=400-5-6-7-8=400-(5+6+7+8)=400-26=374
F= 764-115-268-43-32-20-85-37
=764-(115+85)-(268+32)-(43+37)-20
=764-200-300-80-20
=164
G=350-7-18-52-48-72
=350-(18+72)-(52+48)-7
=350-90-100-7
=160-7
=153
1.M=25+34+47+18+65+99
M= 288
N=78+118+338+258+208
N=1000
P=17+445+199+329
P=990
2.
\(25+34+47+18+65+99\)
\(=25+34+47+18+65+10+19+70\)
\(=\left(25+65+10\right)+\left(34+47+19\right)+70+18\)
\(=200+70+18\)
\(=270+18\)
\(=288\)
\(Q=165+247+528+125+315\)
\(=\left(247+528+125\right)+\left(165+315\right)\)
\(=900+480\)
\(=1280\)
\(R=1000+200+30+4+5000+600+70+8+80\)
\(=\left(1000+5000\right)+\left(200+600\right)+\left(30+70+80\right)+\left(4+8+8\right)\)
\(=6000+800+180+20\)
\(=6000+\left(800+100\right)+\left(80+20\right)\)
\(=6000+900+100\)
\(=7000\)
\(A=200+43-100+3\)
\(=100+46\)
\(=146\)
A = 243 - 97 = 200 + 43 - 90 - 7 = 110 + (43 - 7) = 110 + 36 = 146
B = 400 - 42 - 58 = 400 - (42 + 58) = 400 - 100 = 300
C = 600 - 67 - 33 = 600 - (67 + 33) = 600 - 100 = 500
D = 200 - 24 - 46 = 200 - (24 + 46) = 200 - 70 = 130
E = 400 - 5 - 6 - 7 - 8 = 400 - (5 + 7 + 8) - 6 = 400 - 20 - 6 = 380 - 6 = 374
F = 764 - 115 - 268 - 43 - 32 - 20 - 85 - 37 = 700 + 60 + 4 - (100 + 10 + 5) - (200 + 60 + 8) - (40 + 3) - (30 + 2) - 20 - (80 + 5) - (30 + 7)
= 700 + 60 + 4 - 100 - 10 - 5 - 200 - 60 - 8 - 40 - 3 - 30 - 2 - 20 - 80 - 5 - 30 - 7
= 400 - 210 - 26 = 190 - 26 = 164
G = 350 - 7 - 18 - 52 - 48 - 72 = 350 - (52 + 48) - (7 + 18 + 72)
= 350 - 100 - 90 - 7 = 250 - 90 - 7 = 160 - 7 = 153