Toán Lớp 6: sfjltính bằng cách hợp lý
21 ×7 ²-11 ×7 ²+90 ×7 ²+49 ×125 ×16
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Toán Lớp 6: sfjltính bằng cách hợp lý
21 ×7 ²-11 ×7 ²+90 ×7 ²+49 ×125 ×16
Comments ( 2 )
=21 ×7^2-11 ×7^2+90 ×7^2+7^2 ×125 ×16
=7^2(21-11+90+125×16)
=7^2×2100
=492100
=11025×16
=102900