a,64.25+35.25+25
b, 58.42+32.8+5.16
c,135+360+65+40
d,463+318+137+22
e,(42.43+43.57+430-360:4
f,(372-19.4+(981:9-13)
g,456:2.18+456:3-102
h,20+21+22+…=29+30
TÍNH NHANH GIÚP MK VỚI Ạ( LƯU Ý:DẤU “CHẤM” = DẤU NHÂN Ạ)
a,64.25+35.25+25
b, 58.42+32.8+5.16
c,135+360+65+40
d,463+318+137+22
e,(42.43+43.57+430-360:4
f,(372-19.4+(981:9-13)
g,456:2.18+456:3-102
h,20+21+22+…=29+30
TÍNH NHANH GIÚP MK VỚI Ạ( LƯU Ý:DẤU “CHẤM” = DẤU NHÂN Ạ)
a, 25.(64+35+1)
=25.100
=2500
b, 58×42+32×8+5×16
=16 x 126 + 16 x 16 + 16 x 5
= 2436+256+80
= 2772
c,135+360+65+40
=(135+65)+(360+40)
=200+400=600
d,463+318+137+22
=(463+137)+(318+22)
=600+340=940
e,(42×43+43×57+430-360:4
=1806+2451+430-90=4597
f,(372-19×4+(981:9-13)
=372-76+109-13
=296+109-13
=405-13=392
g,456:2×18+456:3-102
=456×9+456×1/3-102
=456x(9+1/3)-102
=456×28/3-102
=4256-102=4154
h,20+21+22+…=29+30
= (20 + 30) + (21 + 29) + (22 + 28) + (23 + 27) + (24 + 26) + 25
= 50 + 50 + 50 + 50 + 50 + 25
= 5×50 + 25 = 250 + 25 = 275
Giải thích các bước giải:+Đáp án:
a, 64×25+35×25+25
= (64+35+1)x25
=100×25=2500
b, 58×42+32×8+5×16
=16 x 126 + 16 x 16 + 16 x 5
= 2436+256+80
= 2772
c,135+360+65+40
=(135+65)+(360+40)
=200+400=600
d,463+318+137+22
=(463+137)+(318+22)
=600+340=940
e,(42×43+43×57+43)-360:4
=(42+57+1)x 43
=100×43
=4300-90=4210
f,(372-19×4+(981:9-13)
=372-76+109-13
=296+109-13
=405-13=392
g,456:2×18+456:3-102
=456×9+456×1/3-102
=456x(9+1/3)-102
=456×28/3-102
=4256-102=4154
h,20+21+22+…=29+30
= (20 + 30) + (21 + 29) + (22 + 28) + (23 + 27) + (24 + 26) + 25
= 50 + 50 + 50 + 50 + 50 + 25
= 5×50 + 25 = 250 + 25 = 275
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