Toán Lớp 3: Tính nhanh:
a) 4 x 18 + 83 x 4 – 4
b) 54 : 50 + 46 : 50
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Toán Lớp 3: Tính nhanh:
a) 4 x 18 + 83 x 4 – 4
b) 54 : 50 + 46 : 50
Comments ( 2 )
a, 4 xx 18 + 83 xx 4 – 4
= 4 xx 18 + 83 xx 4 – 4 xx1
= 4 xx ( 18 + 83 -1 )
= 4 xx100
= 400
b, 54 : 50 + 46 : 50
= 100 : 50
= 2