4.9×5.8+2.9×1.4+44×O.58
=4.9X2.9x2+2.9×1.4+4.4X2.9×2
=2.9X(4.9X2+1.4+4.4x2)
=2.9x(9.8+1.4+8.8)
=2.9x20
=58
解:原式=4.9x5.8+2.9x2x0.7+44x0.58
=4.9x5.8+5.8x0.7+4.4x5.8
=5.8x(4.9+0.7+4.4)
=58
4.9x5.8+2.9x1.4+44x0.58
=4.9x2x2.9+2.9x1.4+4.4x2x2.9
=2.9x(9.8+1.4+8.8)
=2.9x20
=58
可将上式化为
4.9×5.8+2.9×2×(1.4÷2)+4.4×5.8
即(4.9+0.7+4.4)×5.8=58
4.9×5.8+5.8×0.7+4.4×5.8
=5.8×(4.9+0.7+4.4)
=5.8×10
=58