a) \(198+232-98-32\)
\(=\left(198-98\right)+\left(232-32\right)\)
\(=100+200\)
\(=300\)
b) \(91\cdot25-91\cdot13-91\cdot12\)
\(=91\cdot\left(25-13-12\right)\)
\(=91\cdot0\)
\(=0\)
c) \(47\cdot8-27\cdot9+47\cdot12-27\cdot11\)
\(=47\cdot\left(8+12\right)-27\cdot\left(9+11\right)\)
\(=47\cdot20-27\cdot20\)
\(=\left(47-27\right)\cdot20\)
\(=20\cdot20\)
\(=400\)
d) \(236\div3+64\div3\)
\(=\left(236+64\right)\div3\)
\(=300\div3\)
\(=100\)
e) \(1326+358-326+62\)
\(=\left(1326-326\right)+\left(358+62\right)\)
\(=1000+420\)
\(=1420\)
f) \(59\cdot42-35\cdot42-24\cdot2\)
\(=\left(59-35\right)\cdot42-24\cdot2\)
\(=24\cdot42-24\cdot2\)
\(=24\cdot\left(42-2\right)\)
\(=24\cdot40\)
\(=960\)
g) \(42\cdot13-22\cdot5+42\cdot7-15\cdot22\)
\(=\left(42\cdot13+42\cdot7\right)-\left(22\cdot5+15\cdot22\right)\)
\(=42\cdot\left(13+7\right)-22\cdot\left(5+15\right)\)
\(=42\cdot20-22\cdot20\)
\(=\left(42-22\right)\cdot20\)
\(=20\cdot20\)
\(=400\)
* Bổ sung phần h *
h) \(1159\div125-159\div125\)
\(=\left(1159-159\right)\div125\)
\(=1000\div125\)
\(=8\)
@Duongg
a.198+232-98-32=100+98+200+32-98-32(triệt tiêu 98 và 32)còn 200+100=300
b.91.(25-13-12)=91.0=0
c.
d.236:3+64:3=(236+64):3=300:3=100
e.1326+358-326+62=1000+326+358-326+62(triệt tiêu 326)còn lại 1000+358+62=1420
f.
g.
h.1159:125-195:125=1000+159:125-159:125=1000:125=8
thông cảm nhé em mới học lớp 5 thui vì có vài câu em chưa làm đc
Gửi tạm 4 phần đầu :
a) 198 + 232 - 98 - 32 = ( 198 - 98 ) + ( 232 - 32 ) = 100 + 200 = 300
b) 91 . 25 - 91 . 13 - 91 . 12 = 91 . ( 25 - 13 - 12 ) = 91 . 0 = 0
c) 47 . 8 - 27 . 9 + 47 . 12 - 27 . 11
= 47 . ( 8 + 12 ) - 27 . ( 9 + 11 )
= 47 . 20 - 27 . 20
= ( 47 - 27 ) . 20 = 20 . 20 = 400
d) 236 : 3 + 64 : 3 = ( 236 + 64 ) : 3 = 300 : 3 = 100
mình làm ko làm bài a và e
b) 91 . 25 - 91 . 13 - 91 . 12
= 91 . ( 25 - 13 -12 )
= 91 . 0
= 0
c) 47 . 8 - 27 . 9 + 47 . 12 - 27 . 11
= 47 . ( 8 + 12 ) - 27 . ( 9 + 11 )
= 47 . 20 - 27 . 20
= 20 . ( 47 - 27 )
= 20 . 20
= 400
Gửi nốt 4 phần cuối :
e) 1326 + 358 - 326 + 62 = ( 1326 - 326 ) + ( 358 + 62 ) = 1000 + 420 = 1420
f) 59 . 42 - 35 . 42 - 24 . 2 = 42 . ( 59 - 35 - 2 ) = 24 . 22 = 528
g) 42 . 13 - 22 . 5 + 42 . 7 - 15 . 22
= 42 . ( 13 + 7 ) - 22 . ( 5 + 15 )
= 42 . 20 - 22 . 20
= 20 . ( 42 - 22 ) = 20 . 20 = 400
h) 1159 : 125 - 159 : 125 = ( 1159 - 159 ) : 125 = 1000 : 125 = 8
e) 1326 + 358 - 326 + 62
= ( 1326 - 326 ) + ( 358 + 62 )
= 1000 + 420
= 1420
f) 59.42 - 35.42 - 24.2
=( 59.42 - 35.42 ) - 24.2
= 42 . ( 59 - 35 ) - 24.2
= 42.24 - 24.2
= 24.( 42 - 2 )
= 24 . 40
= 960
g ) 42.13 - 22.5 + 42.7 - 15.22
= ( 42.13 + 42.7 ) - ( 22.5 + 15.22 )
= 42 ( 13 + 7 ) - 22.( 5 + 15 )
= 42.20 - 22.20
= 20.( 42 - 22 )
= 20 . 20
= 400
h ) 1159 : 125 - 159 : 125
= ( 1159 - 159 ) : 125
= 1000 : 125
= 8
HOk tốt!!!!!!!!!!!!!!
a 198 + 232 - 98 -32 b 91 . 25 - 91 .13 - 91 . 12 = 91 . ( 25 - 13 - 12 ) = 91. 0 = 0
198 - 98 + 232 - 32
100 + 200
= 300
giúp mik với ạ mik cần gấp! Cảm ơn trước 🥰
