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Hướng dẫn giải:
5000 + 7000 = 12 000
37 000 – 6000 = 31 000
4000 x 5 = 20 000
48 000 : 6 = 8000
Cách nhẩm:
5 + 7 = 12 nên 5000 + 7000 = 12 000
37 – 6 = 31 nên 37 000 – 6000 = 31 000
4 x 5 = 20 nên 4000 x 5 = 20 000
48 : 6 = 8 nên 48 000 : 6 = 8000
152 399 + 24 457 = 176 856
6992 508 – 22 384 = 6 970 124
429 089 x 5 = 2 145 445
143 263 : 9 = 15 918 dư 1
a)
75 X(x+157)=24450
x+157 =24450:157
x+157 =326
x =326-7
x =319
b)41846: (x-384)=98
x-384 =41846:98
x-384 =427
x =427+384
x =811
x-384 =
a) 75 x ( X + 157 ) = 24450
X + 157 = 24450 : 75
X + 157 = 326
X = 326 - 157
X = 169
Vậy X = 169
b) 41846 : ( X - 384 ) = 98
X - 384 = 41846 : 98
X - 384 = 427
X = 427 + 384
X = 811
Vậy X = 811
5000:[384x5-1915]=1000