Toán Lớp 6: 37×24+63×79+38×74+21×63 tính nhanh
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Toán Lớp 6: 37×24+63×79+38×74+21×63 tính nhanh
Comments ( 2 )
=37xx24+38xx37xx2+63xx(79+21)
=37xx24+37xx(38xx2)+63xx100
=37xx24+37xx76+63xx100
=37xx(24+76)+63xx100
=37xx100+63xx100
=100xx(37+63)
=100xx100
=10000